/*
- * Copyright (c) 1995-2008 Apple Inc. All rights reserved.
+ * Copyright (c) 1995-2020 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/uio_internal.h>
-#include <sys/malloc.h>
+#include <kern/kalloc.h>
#include <sys/mman.h>
#include <sys/dirent.h>
#include <sys/attr.h>
#include <sys/quota.h>
#include <sys/kdebug.h>
#include <sys/fsevents.h>
+#include <sys/imgsrc.h>
#include <sys/sysproto.h>
+#include <sys/sysctl.h>
#include <sys/xattr.h>
+#include <sys/fcntl.h>
+#include <sys/fsctl.h>
#include <sys/ubc_internal.h>
#include <sys/disk.h>
+#include <sys/content_protection.h>
+#include <sys/clonefile.h>
+#include <sys/snapshot.h>
+#include <sys/priv.h>
+#include <sys/fsgetpath.h>
#include <machine/cons.h>
#include <machine/limits.h>
#include <miscfs/specfs/specdev.h>
-#include <miscfs/union/union.h>
-#include <bsm/audit_kernel.h>
+#include <vfs/vfs_disk_conditioner.h>
+
+#include <security/audit/audit.h>
#include <bsm/audit_kevents.h>
#include <mach/mach_types.h>
#include <kern/kern_types.h>
#include <kern/kalloc.h>
+#include <kern/task.h>
#include <vm/vm_pageout.h>
+#include <vm/vm_protos.h>
#include <libkern/OSAtomic.h>
+#include <os/atomic_private.h>
+#include <pexpert/pexpert.h>
+#include <IOKit/IOBSD.h>
+
+// deps for MIG call
+#include <kern/host.h>
+#include <kern/ipc_misc.h>
+#include <mach/host_priv.h>
+#include <mach/vfs_nspace.h>
+#include <os/log.h>
+
+#include <nfs/nfs_conf.h>
+
+#if ROUTEFS
+#include <miscfs/routefs/routefs.h>
+#endif /* ROUTEFS */
#if CONFIG_MACF
#include <security/mac.h>
#include <security/mac_framework.h>
#endif
-#if CONFIG_FSE
+#if CONFIG_FSE
#define GET_PATH(x) \
- (x) = get_pathbuff();
+ ((x) = get_pathbuff())
#define RELEASE_PATH(x) \
- release_pathbuff(x);
-#else
-#define GET_PATH(x) \
- MALLOC_ZONE((x), char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
+ release_pathbuff(x)
+#else
+#define GET_PATH(x) \
+ ((x) = zalloc(ZV_NAMEI))
#define RELEASE_PATH(x) \
- FREE_ZONE((x), MAXPATHLEN, M_NAMEI);
+ zfree(ZV_NAMEI, x)
#endif /* CONFIG_FSE */
+#ifndef HFS_GET_BOOT_INFO
+#define HFS_GET_BOOT_INFO (FCNTL_FS_SPECIFIC_BASE + 0x00004)
+#endif
+
+#ifndef HFS_SET_BOOT_INFO
+#define HFS_SET_BOOT_INFO (FCNTL_FS_SPECIFIC_BASE + 0x00005)
+#endif
+
+#ifndef APFSIOC_REVERT_TO_SNAPSHOT
+#define APFSIOC_REVERT_TO_SNAPSHOT _IOW('J', 1, u_int64_t)
+#endif
+
+/*
+ * If you need accounting for KM_FD_VN_DATA consider using
+ * ZONE_VIEW_DEFINE to define a zone view.
+ */
+#define KM_FD_VN_DATA KHEAP_DEFAULT
+
+extern void disk_conditioner_unmount(mount_t mp);
+
/* struct for checkdirs iteration */
struct cdirargs {
vnode_t olddp;
static int getutimes(user_addr_t usrtvp, struct timespec *tsp);
static int setutimes(vfs_context_t ctx, vnode_t vp, const struct timespec *ts, int nullflag);
static int sync_callback(mount_t, void *);
-static int munge_statfs(struct mount *mp, struct vfsstatfs *sfsp,
- user_addr_t bufp, int *sizep, boolean_t is_64_bit,
- boolean_t partial_copy);
-static int statfs64_common(struct mount *mp, struct vfsstatfs *sfsp, user_addr_t bufp);
-int (*union_dircheckp)(struct vnode **, struct fileproc *, vfs_context_t);
+static int munge_statfs(struct mount *mp, struct vfsstatfs *sfsp,
+ user_addr_t bufp, int *sizep, boolean_t is_64_bit,
+ boolean_t partial_copy);
+static int fsync_common(proc_t p, struct fsync_args *uap, int flags);
+static int mount_common(char *fstypename, vnode_t pvp, vnode_t vp,
+ struct componentname *cnp, user_addr_t fsmountargs,
+ int flags, uint32_t internal_flags, char *labelstr, boolean_t kernelmount,
+ vfs_context_t ctx);
+void vfs_notify_mount(vnode_t pdvp);
-__private_extern__
-int sync_internal(void);
+int prepare_coveredvp(vnode_t vp, vfs_context_t ctx, struct componentname *cnp, const char *fsname, boolean_t skip_auth);
-__private_extern__
-int open1(vfs_context_t, struct nameidata *, int, struct vnode_attr *, register_t *);
+struct fd_vn_data * fg_vn_data_alloc(void);
-__private_extern__
-int unlink1(vfs_context_t, struct nameidata *, int);
+/*
+ * Max retries for ENOENT returns from vn_authorize_{rmdir, unlink, rename}
+ * Concurrent lookups (or lookups by ids) on hard links can cause the
+ * vn_getpath (which does not re-enter the filesystem as vn_getpath_fsenter
+ * does) to return ENOENT as the path cannot be returned from the name cache
+ * alone. We have no option but to retry and hope to get one namei->reverse path
+ * generation done without an intervening lookup, lookup by id on the hard link
+ * item. This is only an issue for MAC hooks which cannot reenter the filesystem
+ * which currently are the MAC hooks for rename, unlink and rmdir.
+ */
+#define MAX_AUTHORIZE_ENOENT_RETRIES 1024
+/* Max retry limit for rename due to vnode recycling. */
+#define MAX_RENAME_ERECYCLE_RETRIES 1024
-#ifdef __APPLE_API_OBSOLETE
-struct fstatv_args {
- int fd; /* file descriptor of the target file */
- struct vstat *vsb; /* vstat structure for returned info */
-};
-struct lstatv_args {
- const char *path; /* pathname of the target file */
- struct vstat *vsb; /* vstat structure for returned info */
-};
-struct mkcomplex_args {
- const char *path; /* pathname of the file to be created */
- mode_t mode; /* access mode for the newly created file */
- u_long type; /* format of the complex file */
-};
-struct statv_args {
- const char *path; /* pathname of the target file */
- struct vstat *vsb; /* vstat structure for returned info */
-};
+static int rmdirat_internal(vfs_context_t, int, user_addr_t, enum uio_seg,
+ int unlink_flags);
-int fstatv(proc_t p, struct fstatv_args *uap, register_t *retval);
-int lstatv(proc_t p, struct lstatv_args *uap, register_t *retval);
-int mkcomplex(proc_t p, struct mkcomplex_args *uap, register_t *retval);
-int statv(proc_t p, struct statv_args *uap, register_t *retval);
+static int fsgetpath_internal(vfs_context_t, int, uint64_t, vm_size_t, caddr_t, uint32_t options, int *);
-#endif /* __APPLE_API_OBSOLETE */
+#ifdef CONFIG_IMGSRC_ACCESS
+static int authorize_devpath_and_update_mntfromname(mount_t mp, user_addr_t devpath, vnode_t *devvpp, vfs_context_t ctx);
+static int place_mount_and_checkdirs(mount_t mp, vnode_t vp, vfs_context_t ctx);
+static void undo_place_on_covered_vp(mount_t mp, vnode_t vp);
+static int mount_begin_update(mount_t mp, vfs_context_t ctx, int flags);
+static void mount_end_update(mount_t mp);
+static int relocate_imageboot_source(vnode_t pvp, vnode_t vp, struct componentname *cnp, const char *fsname, vfs_context_t ctx, boolean_t is64bit, user_addr_t fsmountargs, boolean_t by_index);
+#endif /* CONFIG_IMGSRC_ACCESS */
+
+#if CONFIG_LOCKERBOOT
+int mount_locker_protoboot(const char *fsname, const char *mntpoint,
+ const char *pbdevpath);
+#endif
+
+//snapshot functions
+#if CONFIG_MNT_ROOTSNAP
+static int __attribute__ ((noinline)) snapshot_root(int dirfd, user_addr_t name, uint32_t flags, vfs_context_t ctx);
+#else
+static int __attribute__ ((noinline)) snapshot_root(int dirfd, user_addr_t name, uint32_t flags, vfs_context_t ctx) __attribute__((unused));
+#endif
+
+__private_extern__
+int sync_internal(void);
+
+__private_extern__
+int unlink1(vfs_context_t, vnode_t, user_addr_t, enum uio_seg, int);
+
+extern lck_grp_t *fd_vn_lck_grp;
+extern lck_grp_attr_t *fd_vn_lck_grp_attr;
+extern lck_attr_t *fd_vn_lck_attr;
+
+extern lck_rw_t * rootvnode_rw_lock;
/*
* incremented each time a mount or unmount operation occurs
* used to invalidate the cached value of the rootvp in the
* mount structure utilized by cache_lookup_path
*/
-int mount_generation = 0;
+uint32_t mount_generation = 0;
/* counts number of mount and unmount operations */
-unsigned int vfs_nummntops=0;
+unsigned int vfs_nummntops = 0;
-extern struct fileops vnops;
-extern errno_t rmdir_remove_orphaned_appleDouble(vnode_t, vfs_context_t, int *);
+/* system-wide, per-boot unique mount ID */
+static _Atomic uint64_t mount_unique_id = 1;
+extern const struct fileops vnops;
+#if CONFIG_APPLEDOUBLE
+extern errno_t rmdir_remove_orphaned_appleDouble(vnode_t, vfs_context_t, int *);
+#endif /* CONFIG_APPLEDOUBLE */
/*
* Virtual File System System Calls
*/
+#if CONFIG_NFS_CLIENT || DEVFS || ROUTEFS
+/*
+ * Private in-kernel mounting spi (NFS only, not exported)
+ */
+__private_extern__
+boolean_t
+vfs_iskernelmount(mount_t mp)
+{
+ return (mp->mnt_kern_flag & MNTK_KERNEL_MOUNT) ? TRUE : FALSE;
+}
+
+__private_extern__
+int
+kernel_mount(char *fstype, vnode_t pvp, vnode_t vp, const char *path,
+ void *data, __unused size_t datalen, int syscall_flags, uint32_t kern_flags, vfs_context_t ctx)
+{
+ struct nameidata nd;
+ boolean_t did_namei;
+ int error;
+
+ NDINIT(&nd, LOOKUP, OP_MOUNT, FOLLOW | AUDITVNPATH1 | WANTPARENT,
+ UIO_SYSSPACE, CAST_USER_ADDR_T(path), ctx);
+
+ /*
+ * Get the vnode to be covered if it's not supplied
+ */
+ if (vp == NULLVP) {
+ error = namei(&nd);
+ if (error) {
+ if (kern_flags & (KERNEL_MOUNT_SNAPSHOT | KERNEL_MOUNT_VOLBYROLE_MASK)) {
+ printf("failed to locate mount-on path: %s ", path);
+ }
+ return error;
+ }
+ vp = nd.ni_vp;
+ pvp = nd.ni_dvp;
+ did_namei = TRUE;
+ } else {
+ char *pnbuf = CAST_DOWN(char *, path);
+
+ nd.ni_cnd.cn_pnbuf = pnbuf;
+ nd.ni_cnd.cn_pnlen = (int)(strlen(pnbuf) + 1);
+ did_namei = FALSE;
+ }
+
+ error = mount_common(fstype, pvp, vp, &nd.ni_cnd, CAST_USER_ADDR_T(data),
+ syscall_flags, kern_flags, NULL, TRUE, ctx);
+
+ if (did_namei) {
+ vnode_put(vp);
+ vnode_put(pvp);
+ nameidone(&nd);
+ }
+
+ return error;
+}
+#endif /* CONFIG_NFS_CLIENT || DEVFS */
+
/*
* Mount a file system.
*/
/* ARGSUSED */
int
-mount(proc_t p, struct mount_args *uap, __unused register_t *retval)
+mount(proc_t p, struct mount_args *uap, __unused int32_t *retval)
{
struct __mac_mount_args muap;
muap.flags = uap->flags;
muap.data = uap->data;
muap.mac_p = USER_ADDR_NULL;
- return (__mac_mount(p, &muap, retval));
+ return __mac_mount(p, &muap, retval);
}
int
-__mac_mount(struct proc *p, register struct __mac_mount_args *uap, __unused register_t *retval)
+fmount(__unused proc_t p, struct fmount_args *uap, __unused int32_t *retval)
{
- struct vnode *vp;
+ struct componentname cn;
+ vfs_context_t ctx = vfs_context_current();
+ size_t dummy = 0;
+ int error;
+ int flags = uap->flags;
+ char fstypename[MFSNAMELEN];
+ char *labelstr = NULL; /* regular mount call always sets it to NULL for __mac_mount() */
+ vnode_t pvp;
+ vnode_t vp;
+
+ AUDIT_ARG(fd, uap->fd);
+ AUDIT_ARG(fflags, flags);
+ /* fstypename will get audited by mount_common */
+
+ /* Sanity check the flags */
+ if (flags & (MNT_IMGSRC_BY_INDEX | MNT_ROOTFS)) {
+ return ENOTSUP;
+ }
+
+ if (flags & MNT_UNION) {
+ return EPERM;
+ }
+
+ error = copyinstr(uap->type, fstypename, MFSNAMELEN, &dummy);
+ if (error) {
+ return error;
+ }
+
+ if ((error = file_vnode(uap->fd, &vp)) != 0) {
+ return error;
+ }
+
+ if ((error = vnode_getwithref(vp)) != 0) {
+ file_drop(uap->fd);
+ return error;
+ }
+
+ pvp = vnode_getparent(vp);
+ if (pvp == NULL) {
+ vnode_put(vp);
+ file_drop(uap->fd);
+ return EINVAL;
+ }
+
+ memset(&cn, 0, sizeof(struct componentname));
+ cn.cn_pnbuf = zalloc_flags(ZV_NAMEI, Z_WAITOK);
+ cn.cn_pnlen = MAXPATHLEN;
+
+ if ((error = vn_getpath(vp, cn.cn_pnbuf, &cn.cn_pnlen)) != 0) {
+ zfree(ZV_NAMEI, cn.cn_pnbuf);
+ vnode_put(pvp);
+ vnode_put(vp);
+ file_drop(uap->fd);
+ return error;
+ }
+
+ error = mount_common(fstypename, pvp, vp, &cn, uap->data, flags, 0, labelstr, FALSE, ctx);
+
+ zfree(ZV_NAMEI, cn.cn_pnbuf);
+ vnode_put(pvp);
+ vnode_put(vp);
+ file_drop(uap->fd);
+
+ return error;
+}
+
+void
+vfs_notify_mount(vnode_t pdvp)
+{
+ vfs_event_signal(NULL, VQ_MOUNT, (intptr_t)NULL);
+ lock_vnode_and_post(pdvp, NOTE_WRITE);
+}
+
+/*
+ * __mac_mount:
+ * Mount a file system taking into account MAC label behavior.
+ * See mount(2) man page for more information
+ *
+ * Parameters: p Process requesting the mount
+ * uap User argument descriptor (see below)
+ * retval (ignored)
+ *
+ * Indirect: uap->type Filesystem type
+ * uap->path Path to mount
+ * uap->data Mount arguments
+ * uap->mac_p MAC info
+ * uap->flags Mount flags
+ *
+ *
+ * Returns: 0 Success
+ * !0 Not success
+ */
+boolean_t root_fs_upgrade_try = FALSE;
+
+int
+__mac_mount(struct proc *p, register struct __mac_mount_args *uap, __unused int32_t *retval)
+{
+ vnode_t pvp = NULL;
+ vnode_t vp = NULL;
+ int need_nameidone = 0;
+ vfs_context_t ctx = vfs_context_current();
+ char fstypename[MFSNAMELEN];
+ struct nameidata nd;
+ size_t dummy = 0;
+ char *labelstr = NULL;
+ size_t labelsz = 0;
+ int flags = uap->flags;
+ int error;
+#if CONFIG_IMGSRC_ACCESS || CONFIG_MACF
+ boolean_t is_64bit = IS_64BIT_PROCESS(p);
+#else
+#pragma unused(p)
+#endif
+ /*
+ * Get the fs type name from user space
+ */
+ error = copyinstr(uap->type, fstypename, MFSNAMELEN, &dummy);
+ if (error) {
+ return error;
+ }
+
+ /*
+ * Get the vnode to be covered
+ */
+ NDINIT(&nd, LOOKUP, OP_MOUNT, FOLLOW | AUDITVNPATH1 | WANTPARENT,
+ UIO_USERSPACE, uap->path, ctx);
+ error = namei(&nd);
+ if (error) {
+ goto out;
+ }
+ need_nameidone = 1;
+ vp = nd.ni_vp;
+ pvp = nd.ni_dvp;
+
+#ifdef CONFIG_IMGSRC_ACCESS
+ /* Mounting image source cannot be batched with other operations */
+ if (flags == MNT_IMGSRC_BY_INDEX) {
+ error = relocate_imageboot_source(pvp, vp, &nd.ni_cnd, fstypename,
+ ctx, is_64bit, uap->data, (flags == MNT_IMGSRC_BY_INDEX));
+ goto out;
+ }
+#endif /* CONFIG_IMGSRC_ACCESS */
+
+#if CONFIG_MACF
+ /*
+ * Get the label string (if any) from user space
+ */
+ if (uap->mac_p != USER_ADDR_NULL) {
+ struct user_mac mac;
+ size_t ulen = 0;
+
+ if (is_64bit) {
+ struct user64_mac mac64;
+ error = copyin(uap->mac_p, &mac64, sizeof(mac64));
+ mac.m_buflen = (user_size_t)mac64.m_buflen;
+ mac.m_string = (user_addr_t)mac64.m_string;
+ } else {
+ struct user32_mac mac32;
+ error = copyin(uap->mac_p, &mac32, sizeof(mac32));
+ mac.m_buflen = mac32.m_buflen;
+ mac.m_string = mac32.m_string;
+ }
+ if (error) {
+ goto out;
+ }
+ if ((mac.m_buflen > MAC_MAX_LABEL_BUF_LEN) ||
+ (mac.m_buflen < 2)) {
+ error = EINVAL;
+ goto out;
+ }
+ labelsz = mac.m_buflen;
+ labelstr = kheap_alloc(KHEAP_TEMP, labelsz, Z_WAITOK);
+ error = copyinstr(mac.m_string, labelstr, mac.m_buflen, &ulen);
+ if (error) {
+ goto out;
+ }
+ AUDIT_ARG(mac_string, labelstr);
+ }
+#endif /* CONFIG_MACF */
+
+ AUDIT_ARG(fflags, flags);
+
+#if SECURE_KERNEL
+ if (flags & MNT_UNION) {
+ /* No union mounts on release kernels */
+ error = EPERM;
+ goto out;
+ }
+#endif
+
+ if ((vp->v_flag & VROOT) &&
+ (vp->v_mount->mnt_flag & MNT_ROOTFS)) {
+ if (!(flags & MNT_UNION)) {
+ flags |= MNT_UPDATE;
+ } else {
+ /*
+ * For a union mount on '/', treat it as fresh
+ * mount instead of update.
+ * Otherwise, union mouting on '/' used to panic the
+ * system before, since mnt_vnodecovered was found to
+ * be NULL for '/' which is required for unionlookup
+ * after it gets ENOENT on union mount.
+ */
+ flags = (flags & ~(MNT_UPDATE));
+ }
+
+#if SECURE_KERNEL
+ if ((flags & MNT_RDONLY) == 0) {
+ /* Release kernels are not allowed to mount "/" as rw */
+ error = EPERM;
+ goto out;
+ }
+#endif
+ /*
+ * See 7392553 for more details on why this check exists.
+ * Suffice to say: If this check is ON and something tries
+ * to mount the rootFS RW, we'll turn off the codesign
+ * bitmap optimization.
+ */
+#if CHECK_CS_VALIDATION_BITMAP
+ if ((flags & MNT_RDONLY) == 0) {
+ root_fs_upgrade_try = TRUE;
+ }
+#endif
+ }
+
+ error = mount_common(fstypename, pvp, vp, &nd.ni_cnd, uap->data, flags, 0,
+ labelstr, FALSE, ctx);
+
+out:
+
+#if CONFIG_MACF
+ kheap_free(KHEAP_DEFAULT, labelstr, labelsz);
+#endif /* CONFIG_MACF */
+
+ if (vp) {
+ vnode_put(vp);
+ }
+ if (pvp) {
+ vnode_put(pvp);
+ }
+ if (need_nameidone) {
+ nameidone(&nd);
+ }
+
+ return error;
+}
+
+/*
+ * common mount implementation (final stage of mounting)
+ *
+ * Arguments:
+ * fstypename file system type (ie it's vfs name)
+ * pvp parent of covered vnode
+ * vp covered vnode
+ * cnp component name (ie path) of covered vnode
+ * flags generic mount flags
+ * fsmountargs file system specific data
+ * labelstr optional MAC label
+ * kernelmount TRUE for mounts initiated from inside the kernel
+ * ctx caller's context
+ */
+static int
+mount_common(char *fstypename, vnode_t pvp, vnode_t vp,
+ struct componentname *cnp, user_addr_t fsmountargs, int flags, uint32_t internal_flags,
+ char *labelstr, boolean_t kernelmount, vfs_context_t ctx)
+{
+#if !CONFIG_MACF
+#pragma unused(labelstr)
+#endif
struct vnode *devvp = NULLVP;
struct vnode *device_vnode = NULLVP;
#if CONFIG_MACF
#endif
struct mount *mp;
struct vfstable *vfsp = (struct vfstable *)0;
+ struct proc *p = vfs_context_proc(ctx);
int error, flag = 0;
- struct vnode_attr va;
- vfs_context_t ctx = vfs_context_current();
- struct nameidata nd;
- struct nameidata nd1;
- char fstypename[MFSNAMELEN];
- size_t dummy=0;
+ bool flag_set = false;
user_addr_t devpath = USER_ADDR_NULL;
- user_addr_t fsmountargs = uap->data;
int ronly = 0;
int mntalloc = 0;
- mode_t accessmode;
- boolean_t is_64bit;
+ boolean_t vfsp_ref = FALSE;
boolean_t is_rwlock_locked = FALSE;
+ boolean_t did_rele = FALSE;
+ boolean_t have_usecount = FALSE;
+ boolean_t did_set_lmount = FALSE;
- AUDIT_ARG(fflags, uap->flags);
+#if CONFIG_ROSV_STARTUP || CONFIG_MOUNT_VM || CONFIG_BASESYSTEMROOT
+ /* Check for mutually-exclusive flag bits */
+ uint32_t checkflags = (internal_flags & (KERNEL_MOUNT_VOLBYROLE_MASK | KERNEL_MOUNT_BASESYSTEMROOT));
+ int bitcount = 0;
+ while (checkflags != 0) {
+ checkflags &= (checkflags - 1);
+ bitcount++;
+ }
- is_64bit = proc_is64bit(p);
+ if (bitcount > 1) {
+ //not allowed to request multiple mount-by-role flags
+ error = EINVAL;
+ goto out1;
+ }
+#endif
/*
- * Get vnode to be covered
+ * Process an update for an existing mount
*/
- NDINIT(&nd, LOOKUP, NOTRIGGER | FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- error = namei(&nd);
- if (error)
- return (error);
- vp = nd.ni_vp;
-
- if ((vp->v_flag & VROOT) &&
- (vp->v_mount->mnt_flag & MNT_ROOTFS))
- uap->flags |= MNT_UPDATE;
-
- error = copyinstr(uap->type, fstypename, MFSNAMELEN, &dummy);
- if (error)
- goto out1;
-
- if (uap->flags & MNT_UPDATE) {
+ if (flags & MNT_UPDATE) {
if ((vp->v_flag & VROOT) == 0) {
error = EINVAL;
goto out1;
}
mp = vp->v_mount;
- /* unmount in progress return error */
- mount_lock(mp);
- if (mp->mnt_lflag & MNT_LUNMOUNT) {
+ /* if unmount or mount in progress, return error */
+ mount_lock_spin(mp);
+ if (mp->mnt_lflag & (MNT_LUNMOUNT | MNT_LMOUNT)) {
mount_unlock(mp);
error = EBUSY;
goto out1;
}
+ mp->mnt_lflag |= MNT_LMOUNT;
+ did_set_lmount = TRUE;
mount_unlock(mp);
lck_rw_lock_exclusive(&mp->mnt_rwlock);
is_rwlock_locked = TRUE;
* We only allow the filesystem to be reloaded if it
* is currently mounted read-only.
*/
- if ((uap->flags & MNT_RELOAD) &&
+ if ((flags & MNT_RELOAD) &&
((mp->mnt_flag & MNT_RDONLY) == 0)) {
error = ENOTSUP;
goto out1;
}
+
+ /*
+ * If content protection is enabled, update mounts are not
+ * allowed to turn it off.
+ */
+ if ((mp->mnt_flag & MNT_CPROTECT) &&
+ ((flags & MNT_CPROTECT) == 0)) {
+ error = EINVAL;
+ goto out1;
+ }
+
+ /*
+ * can't turn off MNT_REMOVABLE either but it may be an unexpected
+ * failure to return an error for this so we'll just silently
+ * add it if it is not passed in.
+ */
+ if ((mp->mnt_flag & MNT_REMOVABLE) &&
+ ((flags & MNT_REMOVABLE) == 0)) {
+ flags |= MNT_REMOVABLE;
+ }
+
+ /* Can't downgrade the backer of the root FS */
+ if ((mp->mnt_kern_flag & MNTK_BACKS_ROOT) &&
+ (!vfs_isrdonly(mp)) && (flags & MNT_RDONLY)) {
+ error = ENOTSUP;
+ goto out1;
+ }
+
/*
* Only root, or the user that did the original mount is
* permitted to update it.
#if CONFIG_MACF
error = mac_mount_check_remount(ctx, mp);
if (error != 0) {
- lck_rw_done(&mp->mnt_rwlock);
goto out1;
}
#endif
* For non-root users, silently enforce MNT_NOSUID and MNT_NODEV,
* and MNT_NOEXEC if mount point is already MNT_NOEXEC.
*/
- if (suser(vfs_context_ucred(ctx), NULL)) {
- uap->flags |= MNT_NOSUID | MNT_NODEV;
- if (mp->mnt_flag & MNT_NOEXEC)
- uap->flags |= MNT_NOEXEC;
+ if ((!kernelmount) && suser(vfs_context_ucred(ctx), NULL)) {
+ flags |= MNT_NOSUID | MNT_NODEV;
+ if (mp->mnt_flag & MNT_NOEXEC) {
+ flags |= MNT_NOEXEC;
+ }
}
flag = mp->mnt_flag;
+ flag_set = true;
+
- mp->mnt_flag |=
- uap->flags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE);
+
+ mp->mnt_flag |= flags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE);
vfsp = mp->mnt_vtable;
goto update;
- }
- /*
- * If the user is not root, ensure that they own the directory
- * onto which we are attempting to mount.
- */
- VATTR_INIT(&va);
- VATTR_WANTED(&va, va_uid);
- if ((error = vnode_getattr(vp, &va, ctx)) ||
- (va.va_uid != kauth_cred_getuid(vfs_context_ucred(ctx)) &&
- (error = suser(vfs_context_ucred(ctx), &p->p_acflag)))) {
- goto out1;
- }
+ } // MNT_UPDATE
+
/*
* For non-root users, silently enforce MNT_NOSUID and MNT_NODEV, and
* MNT_NOEXEC if mount point is already MNT_NOEXEC.
*/
- if (suser(vfs_context_ucred(ctx), NULL)) {
- uap->flags |= MNT_NOSUID | MNT_NODEV;
- if (vp->v_mount->mnt_flag & MNT_NOEXEC)
- uap->flags |= MNT_NOEXEC;
- }
- if ( (error = VNOP_FSYNC(vp, MNT_WAIT, ctx)) )
- goto out1;
-
- if ( (error = buf_invalidateblks(vp, BUF_WRITE_DATA, 0, 0)) )
- goto out1;
-
- if (vp->v_type != VDIR) {
- error = ENOTDIR;
- goto out1;
+ if ((!kernelmount) && suser(vfs_context_ucred(ctx), NULL)) {
+ flags |= MNT_NOSUID | MNT_NODEV;
+ if (vp->v_mount->mnt_flag & MNT_NOEXEC) {
+ flags |= MNT_NOEXEC;
+ }
}
/* XXXAUDIT: Should we capture the type on the error path as well? */
AUDIT_ARG(text, fstypename);
mount_list_lock();
- for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
- if (!strncmp(vfsp->vfc_name, fstypename, MFSNAMELEN))
+ for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
+ if (!strncmp(vfsp->vfc_name, fstypename, MFSNAMELEN)) {
+ vfsp->vfc_refcount++;
+ vfsp_ref = TRUE;
break;
+ }
+ }
mount_list_unlock();
if (vfsp == NULL) {
error = ENODEV;
goto out1;
}
-#if CONFIG_MACF
- error = mac_mount_check_mount(ctx, vp,
- &nd.ni_cnd, vfsp->vfc_name);
- if (error != 0)
+
+ /*
+ * VFC_VFSLOCALARGS is not currently supported for kernel mounts,
+ * except in ROSV configs and for the initial BaseSystem root.
+ */
+ if (kernelmount && (vfsp->vfc_vfsflags & VFC_VFSLOCALARGS) &&
+ ((internal_flags & KERNEL_MOUNT_VOLBYROLE_MASK) == 0) &&
+ ((internal_flags & KERNEL_MOUNT_BASESYSTEMROOT) == 0)) {
+ error = EINVAL; /* unsupported request */
goto out1;
-#endif
- if (ISSET(vp->v_flag, VMOUNT) && (vp->v_mountedhere != NULL)) {
- error = EBUSY;
+ }
+
+ error = prepare_coveredvp(vp, ctx, cnp, fstypename, ((internal_flags & KERNEL_MOUNT_NOAUTH) != 0));
+ if (error != 0) {
goto out1;
}
- vnode_lock_spin(vp);
- SET(vp->v_flag, VMOUNT);
- vnode_unlock(vp);
/*
- * Allocate and initialize the filesystem.
+ * Allocate and initialize the filesystem (mount_t)
*/
- MALLOC_ZONE(mp, struct mount *, (u_long)sizeof(struct mount),
- M_MOUNT, M_WAITOK);
- bzero((char *)mp, (u_long)sizeof(struct mount));
+ mp = zalloc_flags(mount_zone, Z_WAITOK | Z_ZERO);
mntalloc = 1;
/* Initialize the default IO constraints */
mp->mnt_maxsegwritesize = mp->mnt_maxwritecnt;
mp->mnt_devblocksize = DEV_BSIZE;
mp->mnt_alignmentmask = PAGE_MASK;
+ mp->mnt_ioqueue_depth = MNT_DEFAULT_IOQUEUE_DEPTH;
+ mp->mnt_ioscale = 1;
mp->mnt_ioflags = 0;
mp->mnt_realrootvp = NULLVP;
mp->mnt_authcache_ttl = CACHED_LOOKUP_RIGHT_TTL;
+ mp->mnt_lflag |= MNT_LMOUNT;
+ did_set_lmount = TRUE;
+
TAILQ_INIT(&mp->mnt_vnodelist);
TAILQ_INIT(&mp->mnt_workerqueue);
TAILQ_INIT(&mp->mnt_newvnodes);
is_rwlock_locked = TRUE;
mp->mnt_op = vfsp->vfc_vfsops;
mp->mnt_vtable = vfsp;
- mount_list_lock();
- vfsp->vfc_refcount++;
- mount_list_unlock();
//mp->mnt_stat.f_type = vfsp->vfc_typenum;
mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
- strncpy(mp->mnt_vfsstat.f_fstypename, vfsp->vfc_name, MFSTYPENAMELEN);
- strncpy(mp->mnt_vfsstat.f_mntonname, nd.ni_cnd.cn_pnbuf, MAXPATHLEN);
+ strlcpy(mp->mnt_vfsstat.f_fstypename, vfsp->vfc_name, MFSTYPENAMELEN);
+ do {
+ int pathlen = MAXPATHLEN;
+
+ if (vn_getpath_ext(vp, pvp, mp->mnt_vfsstat.f_mntonname, &pathlen, VN_GETPATH_FSENTER)) {
+ strlcpy(mp->mnt_vfsstat.f_mntonname, cnp->cn_pnbuf, MAXPATHLEN);
+ }
+ } while (0);
mp->mnt_vnodecovered = vp;
mp->mnt_vfsstat.f_owner = kauth_cred_getuid(vfs_context_ucred(ctx));
- mp->mnt_devbsdunit = LOWPRI_MAX_NUM_DEV - 1;
+ mp->mnt_throttle_mask = LOWPRI_MAX_NUM_DEV - 1;
+ mp->mnt_devbsdunit = 0;
+ mp->mnt_mount_id = os_atomic_inc_orig(&mount_unique_id, relaxed);
/* XXX 3762912 hack to support HFS filesystem 'owner' - filesystem may update later */
vfs_setowner(mp, KAUTH_UID_NONE, KAUTH_GID_NONE);
-
+
+#if CONFIG_NFS_CLIENT || DEVFS || ROUTEFS
+ if (kernelmount) {
+ mp->mnt_kern_flag |= MNTK_KERNEL_MOUNT;
+ }
+ if ((internal_flags & KERNEL_MOUNT_PERMIT_UNMOUNT) != 0) {
+ mp->mnt_kern_flag |= MNTK_PERMIT_UNMOUNT;
+ }
+#endif /* CONFIG_NFS_CLIENT || DEVFS */
+
update:
+
/*
* Set the mount level flags.
*/
- if (uap->flags & MNT_RDONLY)
+ if (flags & MNT_RDONLY) {
mp->mnt_flag |= MNT_RDONLY;
- else if (mp->mnt_flag & MNT_RDONLY)
+ } else if (mp->mnt_flag & MNT_RDONLY) {
+ // disallow read/write upgrades of file systems that
+ // had the TYPENAME_OVERRIDE feature set.
+ if (mp->mnt_kern_flag & MNTK_TYPENAME_OVERRIDE) {
+ error = EPERM;
+ goto out1;
+ }
mp->mnt_kern_flag |= MNTK_WANTRDWR;
+ }
mp->mnt_flag &= ~(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
- MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC |
- MNT_UNKNOWNPERMISSIONS | MNT_DONTBROWSE | MNT_AUTOMOUNTED |
- MNT_DEFWRITE | MNT_NOATIME | MNT_QUARANTINE);
- mp->mnt_flag |= uap->flags & (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
- MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC |
- MNT_UNKNOWNPERMISSIONS | MNT_DONTBROWSE | MNT_AUTOMOUNTED |
- MNT_DEFWRITE | MNT_NOATIME | MNT_QUARANTINE);
+ MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC |
+ MNT_UNKNOWNPERMISSIONS | MNT_DONTBROWSE |
+ MNT_AUTOMOUNTED | MNT_DEFWRITE | MNT_NOATIME | MNT_STRICTATIME |
+ MNT_QUARANTINE | MNT_CPROTECT);
+
+#if SECURE_KERNEL
+#if !CONFIG_MNT_SUID
+ /*
+ * On release builds of iOS based platforms, always enforce NOSUID on
+ * all mounts. We do this here because we can catch update mounts as well as
+ * non-update mounts in this case.
+ */
+ mp->mnt_flag |= (MNT_NOSUID);
+#endif
+#endif
+
+ mp->mnt_flag |= flags & (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
+ MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC |
+ MNT_UNKNOWNPERMISSIONS | MNT_DONTBROWSE |
+ MNT_AUTOMOUNTED | MNT_DEFWRITE | MNT_NOATIME | MNT_STRICTATIME |
+ MNT_QUARANTINE | MNT_CPROTECT);
#if CONFIG_MACF
- if (uap->flags & MNT_MULTILABEL) {
+ if (flags & MNT_MULTILABEL) {
if (vfsp->vfc_vfsflags & VFC_VFSNOMACLABEL) {
error = EINVAL;
goto out1;
mp->mnt_flag |= MNT_MULTILABEL;
}
#endif
+ /*
+ * Process device path for local file systems if requested.
+ *
+ * Snapshot and mount-by-role mounts do not use this path; they are
+ * passing other opaque data in the device path field.
+ *
+ * Basesystemroot mounts pass a device path to be resolved here,
+ * but it's just a char * already inside the kernel, which
+ * kernel_mount() shoved into a user_addr_t to call us. So for such
+ * mounts we must skip copyin (both of the address and of the string
+ * (in NDINIT).
+ */
+ if (vfsp->vfc_vfsflags & VFC_VFSLOCALARGS &&
+ !(internal_flags & (KERNEL_MOUNT_SNAPSHOT | KERNEL_MOUNT_VOLBYROLE_MASK))) {
+ boolean_t do_copyin_devpath = true;
+#if CONFIG_BASESYSTEMROOT
+ if (internal_flags & KERNEL_MOUNT_BASESYSTEMROOT) {
+ // KERNEL_MOUNT_BASESYSTEMROOT implies subtle behavior worh nothing:
+ // We have been passed fsmountargs, which is typed as a user_addr_t,
+ // but is actually a char ** pointing to a (kernelspace) string.
+ // We manually unpack it with a series of casts and dereferences
+ // that reverses what was done just above us on the stack in
+ // imageboot_pivot_image().
+ // After retrieving the path to the dev node (which we will NDINIT
+ // in a moment), we pass NULL fsmountargs on to the filesystem.
+ _Static_assert(sizeof(char **) == sizeof(fsmountargs), "fsmountargs should fit a (kernel) address");
+ char **devnamepp = (char **)fsmountargs;
+ char *devnamep = *devnamepp;
+ devpath = CAST_USER_ADDR_T(devnamep);
+ do_copyin_devpath = false;
+ fsmountargs = USER_ADDR_NULL;
+
+ //Now that we have a mp, denote that this mount is for the basesystem.
+ mp->mnt_supl_kern_flag |= MNTK_SUPL_BASESYSTEM;
+ }
+#endif // CONFIG_BASESYSTEMROOT
- if (vfsp->vfc_vfsflags & VFC_VFSLOCALARGS) {
- if (is_64bit) {
- if ( (error = copyin(fsmountargs, (caddr_t)&devpath, sizeof(devpath))) )
- goto out1;
- fsmountargs += sizeof(devpath);
- } else {
- char *tmp;
- if ( (error = copyin(fsmountargs, (caddr_t)&tmp, sizeof(tmp))) )
- goto out1;
- /* munge into LP64 addr */
- devpath = CAST_USER_ADDR_T(tmp);
- fsmountargs += sizeof(tmp);
+ if (do_copyin_devpath) {
+ if (vfs_context_is64bit(ctx)) {
+ if ((error = copyin(fsmountargs, (caddr_t)&devpath, sizeof(devpath)))) {
+ goto out1;
+ }
+ fsmountargs += sizeof(devpath);
+ } else {
+ user32_addr_t tmp;
+ if ((error = copyin(fsmountargs, (caddr_t)&tmp, sizeof(tmp)))) {
+ goto out1;
+ }
+ /* munge into LP64 addr */
+ devpath = CAST_USER_ADDR_T(tmp);
+ fsmountargs += sizeof(tmp);
+ }
}
- /* if it is not update and device name needs to be parsed */
+ /* Lookup device and authorize access to it */
if ((devpath)) {
- NDINIT(&nd1, LOOKUP, FOLLOW, UIO_USERSPACE, devpath, ctx);
- if ( (error = namei(&nd1)) )
+ struct nameidata nd;
+
+ enum uio_seg seg = UIO_USERSPACE;
+#if CONFIG_BASESYSTEMROOT
+ if (internal_flags & KERNEL_MOUNT_BASESYSTEMROOT) {
+ seg = UIO_SYSSPACE;
+ }
+#endif // CONFIG_BASESYSTEMROOT
+
+ NDINIT(&nd, LOOKUP, OP_MOUNT, FOLLOW, seg, devpath, ctx);
+ if ((error = namei(&nd))) {
goto out1;
+ }
- strncpy(mp->mnt_vfsstat.f_mntfromname, nd1.ni_cnd.cn_pnbuf, MAXPATHLEN);
- devvp = nd1.ni_vp;
+ strlcpy(mp->mnt_vfsstat.f_mntfromname, nd.ni_cnd.cn_pnbuf, MAXPATHLEN);
+ devvp = nd.ni_vp;
- nameidone(&nd1);
+ nameidone(&nd);
if (devvp->v_type != VBLK) {
error = ENOTBLK;
goto out2;
}
/*
- * If mount by non-root, then verify that user has necessary
- * permissions on the device.
- */
+ * If mount by non-root, then verify that user has necessary
+ * permissions on the device.
+ */
if (suser(vfs_context_ucred(ctx), NULL) != 0) {
- accessmode = KAUTH_VNODE_READ_DATA;
- if ((mp->mnt_flag & MNT_RDONLY) == 0)
+ mode_t accessmode = KAUTH_VNODE_READ_DATA;
+
+ if ((mp->mnt_flag & MNT_RDONLY) == 0) {
accessmode |= KAUTH_VNODE_WRITE_DATA;
- if ((error = vnode_authorize(devvp, NULL, accessmode, ctx)) != 0)
+ }
+ if ((error = vnode_authorize(devvp, NULL, accessmode, ctx)) != 0) {
goto out2;
+ }
}
}
- if (devpath && ((uap->flags & MNT_UPDATE) == 0)) {
- if ( (error = vnode_ref(devvp)) )
+ /* On first mount, preflight and open device */
+ if (devpath && ((flags & MNT_UPDATE) == 0)) {
+ if ((error = vnode_ref(devvp))) {
goto out2;
+ }
/*
- * Disallow multiple mounts of the same device.
- * Disallow mounting of a device that is currently in use
- * (except for root, which might share swap device for miniroot).
- * Flush out any old buffers remaining from a previous use.
- */
- if ( (error = vfs_mountedon(devvp)) )
+ * Disallow multiple mounts of the same device.
+ * Disallow mounting of a device that is currently in use
+ * (except for root, which might share swap device for miniroot).
+ * Flush out any old buffers remaining from a previous use.
+ */
+ if ((error = vfs_mountedon(devvp))) {
goto out3;
-
+ }
+
if (vcount(devvp) > 1 && !(vfs_flags(mp) & MNT_ROOTFS)) {
error = EBUSY;
goto out3;
}
- if ( (error = VNOP_FSYNC(devvp, MNT_WAIT, ctx)) ) {
+ if ((error = VNOP_FSYNC(devvp, MNT_WAIT, ctx))) {
error = ENOTBLK;
goto out3;
}
- if ( (error = buf_invalidateblks(devvp, BUF_WRITE_DATA, 0, 0)) )
+ if ((error = buf_invalidateblks(devvp, BUF_WRITE_DATA, 0, 0))) {
goto out3;
+ }
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
#if CONFIG_MACF
error = mac_vnode_check_open(ctx,
devvp,
- ronly ? FREAD : FREAD|FWRITE);
- if (error)
+ ronly ? FREAD : FREAD | FWRITE);
+ if (error) {
goto out3;
+ }
#endif /* MAC */
- if ( (error = VNOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, ctx)) )
+ if ((error = VNOP_OPEN(devvp, ronly ? FREAD : FREAD | FWRITE, ctx))) {
goto out3;
+ }
mp->mnt_devvp = devvp;
device_vnode = devvp;
- } else {
- if ((mp->mnt_flag & MNT_RDONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
- /*
- * If upgrade to read-write by non-root, then verify
- * that user has necessary permissions on the device.
- */
- device_vnode = mp->mnt_devvp;
- if (device_vnode && suser(vfs_context_ucred(ctx), NULL)) {
- if ((error = vnode_authorize(device_vnode, NULL,
- KAUTH_VNODE_READ_DATA | KAUTH_VNODE_WRITE_DATA, ctx)) != 0)
- goto out2;
- }
+ } else if ((mp->mnt_flag & MNT_RDONLY) &&
+ (mp->mnt_kern_flag & MNTK_WANTRDWR) &&
+ (device_vnode = mp->mnt_devvp)) {
+ dev_t dev;
+ int maj;
+ /*
+ * If upgrade to read-write by non-root, then verify
+ * that user has necessary permissions on the device.
+ */
+ vnode_getalways(device_vnode);
+
+ if (suser(vfs_context_ucred(ctx), NULL) &&
+ (error = vnode_authorize(device_vnode, NULL,
+ KAUTH_VNODE_READ_DATA | KAUTH_VNODE_WRITE_DATA,
+ ctx)) != 0) {
+ vnode_put(device_vnode);
+ goto out2;
+ }
+
+ /* Tell the device that we're upgrading */
+ dev = (dev_t)device_vnode->v_rdev;
+ maj = major(dev);
+
+ if ((u_int)maj >= (u_int)nblkdev) {
+ panic("Volume mounted on a device with invalid major number.");
}
+
+ error = bdevsw[maj].d_open(dev, FREAD | FWRITE, S_IFBLK, p);
+ vnode_put(device_vnode);
device_vnode = NULLVP;
+ if (error != 0) {
+ goto out2;
+ }
}
- }
+ } // localargs && !(snapshot | data | vm)
+
#if CONFIG_MACF
- if ((uap->flags & MNT_UPDATE) == 0) {
+ if ((flags & MNT_UPDATE) == 0) {
mac_mount_label_init(mp);
mac_mount_label_associate(ctx, mp);
}
- if (uap->mac_p != USER_ADDR_NULL) {
- struct user_mac mac;
- char *labelstr = NULL;
- size_t ulen = 0;
-
- if ((uap->flags & MNT_UPDATE) != 0) {
- error = mac_mount_check_label_update(
- ctx, mp);
- if (error != 0)
+ if (labelstr) {
+ if ((flags & MNT_UPDATE) != 0) {
+ error = mac_mount_check_label_update(ctx, mp);
+ if (error != 0) {
goto out3;
+ }
}
- if (is_64bit) {
- error = copyin(uap->mac_p, &mac, sizeof(mac));
+ }
+#endif
+ /*
+ * Mount the filesystem. We already asserted that internal_flags
+ * cannot have more than one mount-by-role bit set.
+ */
+ if (internal_flags & KERNEL_MOUNT_SNAPSHOT) {
+ error = VFS_IOCTL(mp, VFSIOC_MOUNT_SNAPSHOT,
+ (caddr_t)fsmountargs, 0, ctx);
+ } else if (internal_flags & KERNEL_MOUNT_DATAVOL) {
+#if CONFIG_ROSV_STARTUP
+ struct mount *origin_mp = (struct mount*)fsmountargs;
+ fs_role_mount_args_t frma = {origin_mp, VFS_DATA_ROLE};
+ error = VFS_IOCTL(mp, VFSIOC_MOUNT_BYROLE, (caddr_t)&frma, 0, ctx);
+ if (error) {
+ printf("MOUNT-BY-ROLE (%d) failed! (%d)", VFS_DATA_ROLE, error);
} else {
- struct mac mac32;
- error = copyin(uap->mac_p, &mac32, sizeof(mac32));
- mac.m_buflen = mac32.m_buflen;
- mac.m_string = CAST_USER_ADDR_T(mac32.m_string);
+ /* Mark volume associated with system volume */
+ mp->mnt_kern_flag |= MNTK_SYSTEM;
+
+ /* Attempt to acquire the mnt_devvp and set it up */
+ struct vnode *mp_devvp = NULL;
+ if (mp->mnt_vfsstat.f_mntfromname[0] != 0) {
+ errno_t lerr = vnode_lookup(mp->mnt_vfsstat.f_mntfromname,
+ 0, &mp_devvp, vfs_context_kernel());
+ if (!lerr) {
+ mp->mnt_devvp = mp_devvp;
+ //vnode_lookup took an iocount, need to drop it.
+ vnode_put(mp_devvp);
+ // now set `device_vnode` to the devvp that was acquired.
+ // this is needed in order to ensure vfs_init_io_attributes is invoked.
+ // note that though the iocount above was dropped, the mount acquires
+ // an implicit reference against the device.
+ device_vnode = mp_devvp;
+ }
+ }
}
- if (error != 0)
- goto out3;
- if ((mac.m_buflen > MAC_MAX_LABEL_BUF_LEN) ||
- (mac.m_buflen < 2)) {
- error = EINVAL;
- goto out3;
+#else
+ error = EINVAL;
+#endif
+ } else if (internal_flags & KERNEL_MOUNT_VMVOL) {
+#if CONFIG_MOUNT_VM
+ struct mount *origin_mp = (struct mount*)fsmountargs;
+ fs_role_mount_args_t frma = {origin_mp, VFS_VM_ROLE};
+ error = VFS_IOCTL(mp, VFSIOC_MOUNT_BYROLE, (caddr_t)&frma, 0, ctx);
+ if (error) {
+ printf("MOUNT-BY-ROLE (%d) failed! (%d)", VFS_VM_ROLE, error);
+ } else {
+ /* Mark volume associated with system volume and a swap mount */
+ mp->mnt_kern_flag |= (MNTK_SYSTEM | MNTK_SWAP_MOUNT);
+ /* Attempt to acquire the mnt_devvp and set it up */
+ struct vnode *mp_devvp = NULL;
+ if (mp->mnt_vfsstat.f_mntfromname[0] != 0) {
+ errno_t lerr = vnode_lookup(mp->mnt_vfsstat.f_mntfromname,
+ 0, &mp_devvp, vfs_context_kernel());
+ if (!lerr) {
+ mp->mnt_devvp = mp_devvp;
+ //vnode_lookup took an iocount, need to drop it.
+ vnode_put(mp_devvp);
+
+ // now set `device_vnode` to the devvp that was acquired.
+ // note that though the iocount above was dropped, the mount acquires
+ // an implicit reference against the device.
+ device_vnode = mp_devvp;
+ }
+ }
}
- MALLOC(labelstr, char *, mac.m_buflen, M_MACTEMP, M_WAITOK);
- error = copyinstr(mac.m_string, labelstr, mac.m_buflen, &ulen);
- if (error != 0) {
- FREE(labelstr, M_MACTEMP);
- goto out3;
+#else
+ error = EINVAL;
+#endif
+ } else if ((internal_flags & KERNEL_MOUNT_PREBOOTVOL) || (internal_flags & KERNEL_MOUNT_RECOVERYVOL)) {
+#if CONFIG_MOUNT_PREBOOTRECOVERY
+ struct mount *origin_mp = (struct mount*)fsmountargs;
+ uint32_t mount_role = 0;
+ if (internal_flags & KERNEL_MOUNT_PREBOOTVOL) {
+ mount_role = VFS_PREBOOT_ROLE;
+ } else if (internal_flags & KERNEL_MOUNT_RECOVERYVOL) {
+ mount_role = VFS_RECOVERY_ROLE;
}
- AUDIT_ARG(mac_string, labelstr);
- error = mac_mount_label_internalize(mp->mnt_mntlabel, labelstr);
- FREE(labelstr, M_MACTEMP);
- if (error != 0)
- goto out3;
- }
+
+ if (mount_role != 0) {
+ fs_role_mount_args_t frma = {origin_mp, mount_role};
+ error = VFS_IOCTL(mp, VFSIOC_MOUNT_BYROLE, (caddr_t)&frma, 0, ctx);
+ if (error) {
+ printf("MOUNT-BY-ROLE (%d) failed! (%d)", mount_role, error);
+ } else {
+ // NOT YET - need to qualify how this interacts with shutdown, ERP/ERB, etc
+ /* Mark volume associated with system volume */
+ //mp->mnt_kern_flag |= MNTK_SYSTEM;
+ /* Attempt to acquire the mnt_devvp and set it up */
+ struct vnode *mp_devvp = NULL;
+ if (mp->mnt_vfsstat.f_mntfromname[0] != 0) {
+ errno_t lerr = vnode_lookup(mp->mnt_vfsstat.f_mntfromname,
+ 0, &mp_devvp, vfs_context_kernel());
+ if (!lerr) {
+ mp->mnt_devvp = mp_devvp;
+ //vnode_lookup took an iocount, need to drop it.
+ vnode_put(mp_devvp);
+
+ // now set `device_vnode` to the devvp that was acquired.
+ // note that though the iocount above was dropped, the mount acquires
+ // an implicit reference against the device.
+ device_vnode = mp_devvp;
+ }
+ }
+ }
+ } else {
+ printf("MOUNT-BY-ROLE (%d) failed - ROLE UNRECOGNIZED! (%d)", mount_role, error);
+ error = EINVAL;
+ }
+#else
+ error = EINVAL;
#endif
- if (device_vnode != NULL) {
- VNOP_IOCTL(device_vnode, DKIOCGETBSDUNIT, (caddr_t)&mp->mnt_devbsdunit, 0, NULL);
- mp->mnt_devbsdunit %= LOWPRI_MAX_NUM_DEV;
+ } else {
+ error = VFS_MOUNT(mp, device_vnode, fsmountargs, ctx);
}
- /*
- * Mount the filesystem.
- */
- error = VFS_MOUNT(mp, device_vnode, fsmountargs, ctx);
-
- if (uap->flags & MNT_UPDATE) {
- if (mp->mnt_kern_flag & MNTK_WANTRDWR)
+ if (flags & MNT_UPDATE) {
+ if (mp->mnt_kern_flag & MNTK_WANTRDWR) {
mp->mnt_flag &= ~MNT_RDONLY;
- mp->mnt_flag &=~
+ }
+ mp->mnt_flag &= ~
(MNT_UPDATE | MNT_RELOAD | MNT_FORCE);
- mp->mnt_kern_flag &=~ MNTK_WANTRDWR;
- if (error)
- mp->mnt_flag = flag;
+ mp->mnt_kern_flag &= ~MNTK_WANTRDWR;
+ if (error) {
+ mp->mnt_flag = flag; /* restore flag value */
+ }
vfs_event_signal(NULL, VQ_UPDATE, (intptr_t)NULL);
lck_rw_done(&mp->mnt_rwlock);
is_rwlock_locked = FALSE;
- if (!error)
+ if (!error) {
enablequotas(mp, ctx);
- goto out2;
+ }
+ goto exit;
}
+
/*
* Put the new filesystem on the mount list after root.
*/
if (error == 0) {
- struct vfs_attr vfsattr;
+ struct vfs_attr vfsattr;
#if CONFIG_MACF
+ error = mac_mount_check_mount_late(ctx, mp);
+ if (error != 0) {
+ goto out4;
+ }
+
if (vfs_flags(mp) & MNT_MULTILABEL) {
error = VFS_ROOT(mp, &rvp, ctx);
if (error) {
printf("%s() VFS_ROOT returned %d\n", __func__, error);
- goto out3;
+ goto out4;
}
-
- /* VFS_ROOT provides reference so needref = 0 */
error = vnode_label(mp, NULL, rvp, NULL, 0, ctx);
- if (error)
- goto out3;
+ /*
+ * drop reference provided by VFS_ROOT
+ */
+ vnode_put(rvp);
+
+ if (error) {
+ goto out4;
+ }
}
-#endif /* MAC */
+#endif /* MAC */
vnode_lock_spin(vp);
CLR(vp->v_flag, VMOUNT);
mount_generation++;
name_cache_unlock();
- vnode_ref(vp);
+ error = vnode_ref(vp);
+ if (error != 0) {
+ goto out4;
+ }
+
+ have_usecount = TRUE;
error = checkdirs(vp, ctx);
- if (error != 0) {
+ if (error != 0) {
/* Unmount the filesystem as cdir/rdirs cannot be updated */
goto out4;
}
- /*
- * there is no cleanup code here so I have made it void
+ /*
+ * there is no cleanup code here so I have made it void
* we need to revisit this
*/
(void)VFS_START(mp, 0, ctx);
- mount_list_add(mp);
+ if (mount_list_add(mp) != 0) {
+ /*
+ * The system is shutting down trying to umount
+ * everything, so fail with a plausible errno.
+ */
+ error = EBUSY;
+ goto out4;
+ }
lck_rw_done(&mp->mnt_rwlock);
is_rwlock_locked = FALSE;
VFSATTR_INIT(&vfsattr);
VFSATTR_WANTED(&vfsattr, f_capabilities);
if (strncmp(mp->mnt_vfsstat.f_fstypename, "webdav", sizeof("webdav")) != 0 &&
- vfs_getattr(mp, &vfsattr, ctx) == 0 &&
+ vfs_getattr(mp, &vfsattr, ctx) == 0 &&
VFSATTR_IS_SUPPORTED(&vfsattr, f_capabilities)) {
if ((vfsattr.f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_EXTENDED_ATTR) &&
(vfsattr.f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_EXTENDED_ATTR)) {
/* Legacy MNT_DOVOLFS flag also implies path from id lookups. */
mp->mnt_kern_flag |= MNTK_PATH_FROM_ID;
}
+
+ if ((vfsattr.f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] & VOL_CAP_FMT_DIR_HARDLINKS) &&
+ (vfsattr.f_capabilities.valid[VOL_CAPABILITIES_FORMAT] & VOL_CAP_FMT_DIR_HARDLINKS)) {
+ mp->mnt_kern_flag |= MNTK_DIR_HARDLINKS;
+ }
}
if (mp->mnt_vtable->vfc_vfsflags & VFC_VFSNATIVEXATTR) {
mp->mnt_kern_flag |= MNTK_EXTENDED_ATTRS;
mp->mnt_kern_flag |= MNTK_UNMOUNT_PREFLIGHT;
}
/* increment the operations count */
- OSAddAtomic(1, (SInt32 *)&vfs_nummntops);
+ OSAddAtomic(1, &vfs_nummntops);
enablequotas(mp, ctx);
if (device_vnode) {
* defaults will have been set, so no reason to bail or care
*/
vfs_init_io_attributes(device_vnode, mp);
- }
+ }
/* Now that mount is setup, notify the listeners */
- vfs_event_signal(NULL, VQ_MOUNT, (intptr_t)NULL);
+ vfs_notify_mount(pvp);
+ IOBSDMountChange(mp, kIOMountChangeMount);
} else {
+ /* If we fail a fresh mount, there should be no vnodes left hooked into the mountpoint. */
+ if (mp->mnt_vnodelist.tqh_first != NULL) {
+ panic("mount_common(): mount of %s filesystem failed with %d, but vnode list is not empty.",
+ mp->mnt_vtable->vfc_name, error);
+ }
+
vnode_lock_spin(vp);
CLR(vp->v_flag, VMOUNT);
vnode_unlock(vp);
mp->mnt_vtable->vfc_refcount--;
mount_list_unlock();
- if (device_vnode ) {
- VNOP_CLOSE(device_vnode, ronly ? FREAD : FREAD|FWRITE, ctx);
+ if (device_vnode) {
vnode_rele(device_vnode);
+ VNOP_CLOSE(device_vnode, ronly ? FREAD : FREAD | FWRITE, ctx);
}
lck_rw_done(&mp->mnt_rwlock);
is_rwlock_locked = FALSE;
+
+ /*
+ * if we get here, we have a mount structure that needs to be freed,
+ * but since the coveredvp hasn't yet been updated to point at it,
+ * no need to worry about other threads holding a crossref on this mp
+ * so it's ok to just free it
+ */
mount_lock_destroy(mp);
#if CONFIG_MACF
mac_mount_label_destroy(mp);
#endif
- FREE_ZONE((caddr_t)mp, sizeof (struct mount), M_MOUNT);
+ zfree(mount_zone, mp);
+ did_set_lmount = false;
}
- nameidone(&nd);
-
+exit:
/*
- * drop I/O count on covered 'vp' and
- * on the device vp if there was one
+ * drop I/O count on the device vp if there was one
*/
- if (devpath && devvp)
- vnode_put(devvp);
- vnode_put(vp);
+ if (devpath && devvp) {
+ vnode_put(devvp);
+ }
+
+ if (did_set_lmount) {
+ mount_lock_spin(mp);
+ mp->mnt_lflag &= ~MNT_LMOUNT;
+ mount_unlock(mp);
+ }
+
+ return error;
- return(error);
+/* Error condition exits */
out4:
(void)VFS_UNMOUNT(mp, MNT_FORCE, ctx);
- if (device_vnode != NULLVP) {
- VNOP_CLOSE(device_vnode, mp->mnt_flag & MNT_RDONLY ? FREAD : FREAD|FWRITE,
- ctx);
+ /*
+ * If the mount has been placed on the covered vp,
+ * it may have been discovered by now, so we have
+ * to treat this just like an unmount
+ */
+ mount_lock_spin(mp);
+ mp->mnt_lflag |= MNT_LDEAD;
+ mount_unlock(mp);
+
+ if (device_vnode != NULLVP) {
+ vnode_rele(device_vnode);
+ VNOP_CLOSE(device_vnode, mp->mnt_flag & MNT_RDONLY ? FREAD : FREAD | FWRITE,
+ ctx);
+ did_rele = TRUE;
}
+
vnode_lock_spin(vp);
+
+ mp->mnt_crossref++;
vp->v_mountedhere = (mount_t) 0;
+
vnode_unlock(vp);
- vnode_rele(vp);
+
+ if (have_usecount) {
+ vnode_rele(vp);
+ }
out3:
- if (devpath && ((uap->flags & MNT_UPDATE) == 0))
+ if (devpath && ((flags & MNT_UPDATE) == 0) && (!did_rele)) {
vnode_rele(devvp);
+ }
out2:
- if (devpath && devvp)
- vnode_put(devvp);
+ if (devpath && devvp) {
+ vnode_put(devvp);
+ }
out1:
/* Release mnt_rwlock only when it was taken */
if (is_rwlock_locked == TRUE) {
+ if (flag_set) {
+ mp->mnt_flag = flag; /* restore mnt_flag value */
+ }
lck_rw_done(&mp->mnt_rwlock);
}
+
+ if (did_set_lmount) {
+ mount_lock_spin(mp);
+ mp->mnt_lflag &= ~MNT_LMOUNT;
+ mount_unlock(mp);
+ }
+
if (mntalloc) {
+ if (mp->mnt_crossref) {
+ mount_dropcrossref(mp, vp, 0);
+ } else {
+ mount_lock_destroy(mp);
#if CONFIG_MACF
- mac_mount_label_destroy(mp);
+ mac_mount_label_destroy(mp);
#endif
+ zfree(mount_zone, mp);
+ }
+ }
+ if (vfsp_ref) {
mount_list_lock();
vfsp->vfc_refcount--;
mount_list_unlock();
- FREE_ZONE((caddr_t)mp, sizeof (struct mount), M_MOUNT);
}
- vnode_put(vp);
- nameidone(&nd);
- return(error);
+ return error;
}
-void
-enablequotas(struct mount *mp, vfs_context_t ctx)
+/*
+ * Flush in-core data, check for competing mount attempts,
+ * and set VMOUNT
+ */
+int
+prepare_coveredvp(vnode_t vp, vfs_context_t ctx, struct componentname *cnp, const char *fsname, boolean_t skip_auth)
{
- struct nameidata qnd;
- int type;
- char qfpath[MAXPATHLEN];
- const char *qfname = QUOTAFILENAME;
- const char *qfopsname = QUOTAOPSNAME;
- const char *qfextension[] = INITQFNAMES;
+#if !CONFIG_MACF
+#pragma unused(cnp,fsname)
+#endif
+ struct vnode_attr va;
+ int error;
- /* XXX Shoulkd be an MNTK_ flag, instead of strncmp()'s */
- if ((strncmp(mp->mnt_vfsstat.f_fstypename, "hfs", sizeof("hfs")) != 0 )
- && (strncmp( mp->mnt_vfsstat.f_fstypename, "ufs", sizeof("ufs")) != 0))
- return;
+ if (!skip_auth) {
+ /*
+ * If the user is not root, ensure that they own the directory
+ * onto which we are attempting to mount.
+ */
+ VATTR_INIT(&va);
+ VATTR_WANTED(&va, va_uid);
+ if ((error = vnode_getattr(vp, &va, ctx)) ||
+ (va.va_uid != kauth_cred_getuid(vfs_context_ucred(ctx)) &&
+ (!vfs_context_issuser(ctx)))) {
+ error = EPERM;
+ goto out;
+ }
+ }
- /*
- * Enable filesystem disk quotas if necessary.
- * We ignore errors as this should not interfere with final mount
- */
- for (type=0; type < MAXQUOTAS; type++) {
- snprintf(qfpath, sizeof(qfpath), "%s/%s.%s", mp->mnt_vfsstat.f_mntonname, qfopsname, qfextension[type]);
- NDINIT(&qnd, LOOKUP, FOLLOW, UIO_SYSSPACE32, CAST_USER_ADDR_T(qfpath), ctx);
- if (namei(&qnd) != 0)
- continue; /* option file to trigger quotas is not present */
- vnode_put(qnd.ni_vp);
- nameidone(&qnd);
- snprintf(qfpath, sizeof(qfpath), "%s/%s.%s", mp->mnt_vfsstat.f_mntonname, qfname, qfextension[type]);
+ if ((error = VNOP_FSYNC(vp, MNT_WAIT, ctx))) {
+ goto out;
+ }
- (void) VFS_QUOTACTL(mp, QCMD(Q_QUOTAON, type), 0, qfpath, ctx);
+ if ((error = buf_invalidateblks(vp, BUF_WRITE_DATA, 0, 0))) {
+ goto out;
}
- return;
-}
+ if (vp->v_type != VDIR) {
+ error = ENOTDIR;
+ goto out;
+ }
+
+ if (ISSET(vp->v_flag, VMOUNT) && (vp->v_mountedhere != NULL)) {
+ error = EBUSY;
+ goto out;
+ }
+
+#if CONFIG_MACF
+ error = mac_mount_check_mount(ctx, vp,
+ cnp, fsname);
+ if (error != 0) {
+ goto out;
+ }
+#endif
+
+ vnode_lock_spin(vp);
+ SET(vp->v_flag, VMOUNT);
+ vnode_unlock(vp);
+
+out:
+ return error;
+}
+
+#if CONFIG_IMGSRC_ACCESS
+
+#define DEBUG_IMGSRC 0
+
+#if DEBUG_IMGSRC
+#define IMGSRC_DEBUG(args...) printf("imgsrc: " args)
+#else
+#define IMGSRC_DEBUG(args...) do { } while(0)
+#endif
static int
-checkdirs_callback(proc_t p, void * arg)
+authorize_devpath_and_update_mntfromname(mount_t mp, user_addr_t devpath, vnode_t *devvpp, vfs_context_t ctx)
{
- struct cdirargs * cdrp = (struct cdirargs * )arg;
- vnode_t olddp = cdrp->olddp;
- vnode_t newdp = cdrp->newdp;
- struct filedesc *fdp;
- vnode_t tvp;
- vnode_t fdp_cvp;
- vnode_t fdp_rvp;
- int cdir_changed = 0;
- int rdir_changed = 0;
+ struct nameidata nd;
+ vnode_t vp, realdevvp;
+ mode_t accessmode;
+ int error;
+ enum uio_seg uio = UIO_USERSPACE;
- /*
- * XXX Also needs to iterate each thread in the process to see if it
- * XXX is using a per-thread current working directory, and, if so,
- * XXX update that as well.
- */
+ if (ctx == vfs_context_kernel()) {
+ uio = UIO_SYSSPACE;
+ }
- proc_fdlock(p);
- fdp = p->p_fd;
- if (fdp == (struct filedesc *)0) {
- proc_fdunlock(p);
- return(PROC_RETURNED);
+ NDINIT(&nd, LOOKUP, OP_LOOKUP, FOLLOW, uio, devpath, ctx);
+ if ((error = namei(&nd))) {
+ IMGSRC_DEBUG("namei() failed with %d\n", error);
+ return error;
}
- fdp_cvp = fdp->fd_cdir;
- fdp_rvp = fdp->fd_rdir;
- proc_fdunlock(p);
- if (fdp_cvp == olddp) {
- vnode_ref(newdp);
- tvp = fdp->fd_cdir;
- fdp_cvp = newdp;
- cdir_changed = 1;
- vnode_rele(tvp);
+ vp = nd.ni_vp;
+
+ if (!vnode_isblk(vp)) {
+ IMGSRC_DEBUG("Not block device.\n");
+ error = ENOTBLK;
+ goto out;
}
- if (fdp_rvp == olddp) {
- vnode_ref(newdp);
- tvp = fdp->fd_rdir;
- fdp_rvp = newdp;
- rdir_changed = 1;
- vnode_rele(tvp);
+
+ realdevvp = mp->mnt_devvp;
+ if (realdevvp == NULLVP) {
+ IMGSRC_DEBUG("No device backs the mount.\n");
+ error = ENXIO;
+ goto out;
}
- if (cdir_changed || rdir_changed) {
- proc_fdlock(p);
- fdp->fd_cdir = fdp_cvp;
- fdp->fd_rdir = fdp_rvp;
- proc_fdunlock(p);
+
+ error = vnode_getwithref(realdevvp);
+ if (error != 0) {
+ IMGSRC_DEBUG("Coudn't get iocount on device.\n");
+ goto out;
}
- return(PROC_RETURNED);
-}
+ if (vnode_specrdev(vp) != vnode_specrdev(realdevvp)) {
+ IMGSRC_DEBUG("Wrong dev_t.\n");
+ error = ENXIO;
+ goto out1;
+ }
+ strlcpy(mp->mnt_vfsstat.f_mntfromname, nd.ni_cnd.cn_pnbuf, MAXPATHLEN);
-/*
- * Scan all active processes to see if any of them have a current
- * or root directory onto which the new filesystem has just been
- * mounted. If so, replace them with the new mount point.
- */
-static int
-checkdirs(vnode_t olddp, vfs_context_t ctx)
-{
- vnode_t newdp;
- vnode_t tvp;
- int err;
- struct cdirargs cdr;
- struct uthread * uth = get_bsdthread_info(current_thread());
+ /*
+ * If mount by non-root, then verify that user has necessary
+ * permissions on the device.
+ */
+ if (!vfs_context_issuser(ctx)) {
+ accessmode = KAUTH_VNODE_READ_DATA;
+ if ((mp->mnt_flag & MNT_RDONLY) == 0) {
+ accessmode |= KAUTH_VNODE_WRITE_DATA;
+ }
+ if ((error = vnode_authorize(vp, NULL, accessmode, ctx)) != 0) {
+ IMGSRC_DEBUG("Access denied.\n");
+ goto out1;
+ }
+ }
- if (olddp->v_usecount == 1)
- return(0);
- if (uth != (struct uthread *)0)
- uth->uu_notrigger = 1;
- err = VFS_ROOT(olddp->v_mountedhere, &newdp, ctx);
- if (uth != (struct uthread *)0)
- uth->uu_notrigger = 0;
+ *devvpp = vp;
- if (err != 0) {
-#if DIAGNOSTIC
- panic("mount: lost mount: error %d", err);
-#endif
- return(err);
- }
+out1:
+ vnode_put(realdevvp);
- cdr.olddp = olddp;
- cdr.newdp = newdp;
- /* do not block for exec/fork trans as the vp in cwd & rootdir are not changing */
- proc_iterate(PROC_ALLPROCLIST | PROC_NOWAITTRANS, checkdirs_callback, (void *)&cdr, NULL, NULL);
+out:
+ nameidone(&nd);
- if (rootvnode == olddp) {
- vnode_ref(newdp);
- tvp = rootvnode;
- rootvnode = newdp;
- vnode_rele(tvp);
+ if (error) {
+ vnode_put(vp);
}
- vnode_put(newdp);
- return(0);
+ return error;
}
/*
- * Unmount a file system.
- *
- * Note: unmount takes a path to the vnode mounted on as argument,
- * not special file (as before).
+ * Clear VMOUNT, set v_mountedhere, and mnt_vnodecovered, ref the vnode,
+ * and call checkdirs()
*/
-/* ARGSUSED */
-int
-unmount(__unused proc_t p, struct unmount_args *uap, __unused register_t *retval)
+static int
+place_mount_and_checkdirs(mount_t mp, vnode_t vp, vfs_context_t ctx)
{
- vnode_t vp;
- struct mount *mp;
int error;
- struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
- NDINIT(&nd, LOOKUP, NOTRIGGER | FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- error = namei(&nd);
- if (error)
- return (error);
- vp = nd.ni_vp;
- mp = vp->v_mount;
- nameidone(&nd);
+ mp->mnt_vnodecovered = vp; /* XXX This is normally only set at init-time ... */
+
+ IMGSRC_DEBUG("placing: fsname = %s, vp = %s\n",
+ mp->mnt_vtable->vfc_name, vnode_getname(vp));
+
+ vnode_lock_spin(vp);
+ CLR(vp->v_flag, VMOUNT);
+ vp->v_mountedhere = mp;
+ vnode_unlock(vp);
-#if CONFIG_MACF
- error = mac_mount_check_umount(ctx, mp);
- if (error != 0) {
- vnode_put(vp);
- return (error);
- }
-#endif
/*
- * Must be the root of the filesystem
+ * taking the name_cache_lock exclusively will
+ * insure that everyone is out of the fast path who
+ * might be trying to use a now stale copy of
+ * vp->v_mountedhere->mnt_realrootvp
+ * bumping mount_generation causes the cached values
+ * to be invalidated
*/
- if ((vp->v_flag & VROOT) == 0) {
- vnode_put(vp);
- return (EINVAL);
+ name_cache_lock();
+ mount_generation++;
+ name_cache_unlock();
+
+ error = vnode_ref(vp);
+ if (error != 0) {
+ goto out;
}
- mount_ref(mp, 0);
- vnode_put(vp);
- /* safedounmount consumes the mount ref */
- return (safedounmount(mp, uap->flags, ctx));
-}
-int
-vfs_unmountbyfsid(fsid_t * fsid, int flags, vfs_context_t ctx)
-{
- mount_t mp;
+ error = checkdirs(vp, ctx);
+ if (error != 0) {
+ /* Unmount the filesystem as cdir/rdirs cannot be updated */
+ vnode_rele(vp);
+ goto out;
+ }
- mp = mount_list_lookupby_fsid(fsid, 0, 1);
- if (mp == (mount_t)0) {
- return(ENOENT);
+out:
+ if (error != 0) {
+ mp->mnt_vnodecovered = NULLVP;
}
- mount_ref(mp, 0);
- mount_iterdrop(mp);
- /* safedounmount consumes the mount ref */
- return(safedounmount(mp, flags, ctx));
+ return error;
}
+static void
+undo_place_on_covered_vp(mount_t mp, vnode_t vp)
+{
+ vnode_rele(vp);
+ vnode_lock_spin(vp);
+ vp->v_mountedhere = (mount_t)NULL;
+ vnode_unlock(vp);
+
+ mp->mnt_vnodecovered = NULLVP;
+}
-/*
- * The mount struct comes with a mount ref which will be consumed.
- * Do the actual file system unmount, prevent some common foot shooting.
- */
-int
-safedounmount(struct mount *mp, int flags, vfs_context_t ctx)
+static int
+mount_begin_update(mount_t mp, vfs_context_t ctx, int flags)
{
int error;
- proc_t p = vfs_context_proc(ctx);
+
+ /* unmount in progress return error */
+ mount_lock_spin(mp);
+ if (mp->mnt_lflag & (MNT_LUNMOUNT | MNT_LMOUNT)) {
+ mount_unlock(mp);
+ return EBUSY;
+ }
+ mount_unlock(mp);
+ lck_rw_lock_exclusive(&mp->mnt_rwlock);
/*
- * Only root, or the user that did the original mount is
- * permitted to unmount this filesystem.
+ * We only allow the filesystem to be reloaded if it
+ * is currently mounted read-only.
*/
- if ((mp->mnt_vfsstat.f_owner != kauth_cred_getuid(kauth_cred_get())) &&
- (error = suser(kauth_cred_get(), &p->p_acflag)))
+ if ((flags & MNT_RELOAD) &&
+ ((mp->mnt_flag & MNT_RDONLY) == 0)) {
+ error = ENOTSUP;
goto out;
+ }
/*
- * Don't allow unmounting the root file system.
+ * Only root, or the user that did the original mount is
+ * permitted to update it.
*/
- if (mp->mnt_flag & MNT_ROOTFS) {
- error = EBUSY; /* the root is always busy */
+ if (mp->mnt_vfsstat.f_owner != kauth_cred_getuid(vfs_context_ucred(ctx)) &&
+ (!vfs_context_issuser(ctx))) {
+ error = EPERM;
goto out;
}
-
- return (dounmount(mp, flags, 1, ctx));
+#if CONFIG_MACF
+ error = mac_mount_check_remount(ctx, mp);
+ if (error != 0) {
+ goto out;
+ }
+#endif
out:
- mount_drop(mp, 0);
- return(error);
+ if (error) {
+ lck_rw_done(&mp->mnt_rwlock);
+ }
+
+ return error;
}
-/*
- * Do the actual file system unmount.
- */
-int
-dounmount(struct mount *mp, int flags, int withref, vfs_context_t ctx)
+static void
+mount_end_update(mount_t mp)
+{
+ lck_rw_done(&mp->mnt_rwlock);
+}
+
+static int
+get_imgsrc_rootvnode(uint32_t height, vnode_t *rvpp)
+{
+ vnode_t vp;
+
+ if (height >= MAX_IMAGEBOOT_NESTING) {
+ return EINVAL;
+ }
+
+ vp = imgsrc_rootvnodes[height];
+ if ((vp != NULLVP) && (vnode_get(vp) == 0)) {
+ *rvpp = vp;
+ return 0;
+ } else {
+ return ENOENT;
+ }
+}
+
+static int
+relocate_imageboot_source(vnode_t pvp, vnode_t vp,
+ struct componentname *cnp, const char *fsname, vfs_context_t ctx,
+ boolean_t is64bit, user_addr_t fsmountargs, boolean_t by_index)
{
- vnode_t coveredvp = (vnode_t)0;
int error;
- int needwakeup = 0;
- int forcedunmount = 0;
- int lflags = 0;
- struct vnode *devvp = NULLVP;
+ mount_t mp;
+ boolean_t placed = FALSE;
+ struct vfstable *vfsp;
+ user_addr_t devpath;
+ char *old_mntonname;
+ vnode_t rvp;
+ vnode_t devvp;
+ uint32_t height;
+ uint32_t flags;
- if (flags & MNT_FORCE)
- forcedunmount = 1;
- mount_lock(mp);
- /* XXX post jaguar fix LK_DRAIN - then clean this up */
- if ((flags & MNT_FORCE)) {
- mp->mnt_kern_flag |= MNTK_FRCUNMOUNT;
- mp->mnt_lflag |= MNT_LFORCE;
+ /* If we didn't imageboot, nothing to move */
+ if (imgsrc_rootvnodes[0] == NULLVP) {
+ return EINVAL;
}
- if (mp->mnt_lflag & MNT_LUNMOUNT) {
- mp->mnt_lflag |= MNT_LWAIT;
- if(withref != 0)
- mount_drop(mp, 1);
- msleep((caddr_t)mp, &mp->mnt_mlock, (PVFS | PDROP), "dounmount", NULL);
- /*
- * The prior unmount attempt has probably succeeded.
- * Do not dereference mp here - returning EBUSY is safest.
- */
- return (EBUSY);
+
+ /* Only root can do this */
+ if (!vfs_context_issuser(ctx)) {
+ return EPERM;
}
- mp->mnt_kern_flag |= MNTK_UNMOUNT;
- mp->mnt_lflag |= MNT_LUNMOUNT;
- mp->mnt_flag &=~ MNT_ASYNC;
- /*
- * anyone currently in the fast path that
- * trips over the cached rootvp will be
- * dumped out and forced into the slow path
- * to regenerate a new cached value
- */
- mp->mnt_realrootvp = NULLVP;
- mount_unlock(mp);
-
+
+ IMGSRC_DEBUG("looking for root vnode.\n");
+
/*
- * taking the name_cache_lock exclusively will
- * insure that everyone is out of the fast path who
- * might be trying to use a now stale copy of
- * vp->v_mountedhere->mnt_realrootvp
- * bumping mount_generation causes the cached values
- * to be invalidated
+ * Get root vnode of filesystem we're moving.
*/
- name_cache_lock();
- mount_generation++;
- name_cache_unlock();
-
+ if (by_index) {
+ if (is64bit) {
+ struct user64_mnt_imgsrc_args mia64;
+ error = copyin(fsmountargs, &mia64, sizeof(mia64));
+ if (error != 0) {
+ IMGSRC_DEBUG("Failed to copy in arguments.\n");
+ return error;
+ }
- lck_rw_lock_exclusive(&mp->mnt_rwlock);
- if (withref != 0)
- mount_drop(mp, 0);
-#if CONFIG_FSE
- fsevent_unmount(mp); /* has to come first! */
-#endif
- error = 0;
- if (forcedunmount == 0) {
- ubc_umount(mp); /* release cached vnodes */
- if ((mp->mnt_flag & MNT_RDONLY) == 0) {
- error = VFS_SYNC(mp, MNT_WAIT, ctx);
- if (error) {
- mount_lock(mp);
- mp->mnt_kern_flag &= ~MNTK_UNMOUNT;
- mp->mnt_lflag &= ~MNT_LUNMOUNT;
- mp->mnt_lflag &= ~MNT_LFORCE;
- goto out;
+ height = mia64.mi_height;
+ flags = mia64.mi_flags;
+ devpath = (user_addr_t)mia64.mi_devpath;
+ } else {
+ struct user32_mnt_imgsrc_args mia32;
+ error = copyin(fsmountargs, &mia32, sizeof(mia32));
+ if (error != 0) {
+ IMGSRC_DEBUG("Failed to copy in arguments.\n");
+ return error;
}
+
+ height = mia32.mi_height;
+ flags = mia32.mi_flags;
+ devpath = mia32.mi_devpath;
}
- }
-
- if (forcedunmount)
- lflags |= FORCECLOSE;
- error = vflush(mp, NULLVP, SKIPSWAP | SKIPSYSTEM | SKIPROOT | lflags);
- if ((forcedunmount == 0) && error) {
- mount_lock(mp);
- mp->mnt_kern_flag &= ~MNTK_UNMOUNT;
- mp->mnt_lflag &= ~MNT_LUNMOUNT;
- mp->mnt_lflag &= ~MNT_LFORCE;
- goto out;
+ } else {
+ /*
+ * For binary compatibility--assumes one level of nesting.
+ */
+ if (is64bit) {
+ if ((error = copyin(fsmountargs, (caddr_t)&devpath, sizeof(devpath)))) {
+ return error;
+ }
+ } else {
+ user32_addr_t tmp;
+ if ((error = copyin(fsmountargs, (caddr_t)&tmp, sizeof(tmp)))) {
+ return error;
+ }
+
+ /* munge into LP64 addr */
+ devpath = CAST_USER_ADDR_T(tmp);
+ }
+
+ height = 0;
+ flags = 0;
}
- /* make sure there are no one in the mount iterations or lookup */
- mount_iterdrain(mp);
+ if (flags != 0) {
+ IMGSRC_DEBUG("%s: Got nonzero flags.\n", __FUNCTION__);
+ return EINVAL;
+ }
- error = VFS_UNMOUNT(mp, flags, ctx);
- if (error) {
- mount_iterreset(mp);
- mount_lock(mp);
- mp->mnt_kern_flag &= ~MNTK_UNMOUNT;
- mp->mnt_lflag &= ~MNT_LUNMOUNT;
- mp->mnt_lflag &= ~MNT_LFORCE;
- goto out;
+ error = get_imgsrc_rootvnode(height, &rvp);
+ if (error != 0) {
+ IMGSRC_DEBUG("getting old root vnode failed with %d\n", error);
+ return error;
}
- /* increment the operations count */
- if (!error)
- OSAddAtomic(1, (SInt32 *)&vfs_nummntops);
+ IMGSRC_DEBUG("got old root vnode\n");
- if ( mp->mnt_devvp && mp->mnt_vtable->vfc_vfsflags & VFC_VFSLOCALARGS) {
- /* hold an io reference and drop the usecount before close */
- devvp = mp->mnt_devvp;
- vnode_clearmountedon(devvp);
- vnode_getalways(devvp);
- vnode_rele(devvp);
- VNOP_CLOSE(devvp, mp->mnt_flag & MNT_RDONLY ? FREAD : FREAD|FWRITE,
- ctx);
- vnode_put(devvp);
+ old_mntonname = zalloc_flags(ZV_NAMEI, Z_WAITOK);
+
+ /* Can only move once */
+ mp = vnode_mount(rvp);
+ if ((mp->mnt_kern_flag & MNTK_HAS_MOVED) == MNTK_HAS_MOVED) {
+ IMGSRC_DEBUG("Already moved.\n");
+ error = EBUSY;
+ goto out0;
}
- lck_rw_done(&mp->mnt_rwlock);
- mount_list_remove(mp);
- lck_rw_lock_exclusive(&mp->mnt_rwlock);
-
- /* mark the mount point hook in the vp but not drop the ref yet */
- if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) {
- vnode_getwithref(coveredvp);
- vnode_lock_spin(coveredvp);
- coveredvp->v_mountedhere = (struct mount *)0;
- vnode_unlock(coveredvp);
- vnode_put(coveredvp);
+
+ IMGSRC_DEBUG("moving rvp: fsname = %s\n", mp->mnt_vtable->vfc_name);
+ IMGSRC_DEBUG("Starting updated.\n");
+
+ /* Get exclusive rwlock on mount, authorize update on mp */
+ error = mount_begin_update(mp, ctx, 0);
+ if (error != 0) {
+ IMGSRC_DEBUG("Starting updated failed with %d\n", error);
+ goto out0;
}
- mount_list_lock();
- mp->mnt_vtable->vfc_refcount--;
- mount_list_unlock();
+ /*
+ * It can only be moved once. Flag is set under the rwlock,
+ * so we're now safe to proceed.
+ */
+ if ((mp->mnt_kern_flag & MNTK_HAS_MOVED) == MNTK_HAS_MOVED) {
+ IMGSRC_DEBUG("Already moved [2]\n");
+ goto out1;
+ }
- cache_purgevfs(mp); /* remove cache entries for this file sys */
- vfs_event_signal(NULL, VQ_UNMOUNT, (intptr_t)NULL);
- mount_lock(mp);
- mp->mnt_lflag |= MNT_LDEAD;
+ IMGSRC_DEBUG("Preparing coveredvp.\n");
- if (mp->mnt_lflag & MNT_LWAIT) {
- /*
- * do the wakeup here
- * in case we block in mount_refdrain
- * which will drop the mount lock
- * and allow anyone blocked in vfs_busy
- * to wakeup and see the LDEAD state
- */
- mp->mnt_lflag &= ~MNT_LWAIT;
- wakeup((caddr_t)mp);
+ /* Mark covered vnode as mount in progress, authorize placing mount on top */
+ error = prepare_coveredvp(vp, ctx, cnp, fsname, FALSE);
+ if (error != 0) {
+ IMGSRC_DEBUG("Preparing coveredvp failed with %d.\n", error);
+ goto out1;
}
- mount_refdrain(mp);
-out:
- if (mp->mnt_lflag & MNT_LWAIT) {
- mp->mnt_lflag &= ~MNT_LWAIT;
- needwakeup = 1;
+
+ IMGSRC_DEBUG("Covered vp OK.\n");
+
+ /* Sanity check the name caller has provided */
+ vfsp = mp->mnt_vtable;
+ if (strncmp(vfsp->vfc_name, fsname, MFSNAMELEN) != 0) {
+ IMGSRC_DEBUG("Wrong fs name: actual = %s, expected = %s\n",
+ vfsp->vfc_name, fsname);
+ error = EINVAL;
+ goto out2;
}
- mount_unlock(mp);
- lck_rw_done(&mp->mnt_rwlock);
- if (needwakeup)
- wakeup((caddr_t)mp);
- if (!error) {
- if ((coveredvp != NULLVP)) {
- vnode_getwithref(coveredvp);
- vnode_rele(coveredvp);
- vnode_lock_spin(coveredvp);
- if(mp->mnt_crossref == 0) {
- vnode_unlock(coveredvp);
- mount_lock_destroy(mp);
-#if CONFIG_MACF
- mac_mount_label_destroy(mp);
-#endif
- FREE_ZONE((caddr_t)mp, sizeof (struct mount), M_MOUNT);
- } else {
- coveredvp->v_lflag |= VL_MOUNTDEAD;
- vnode_unlock(coveredvp);
+ /* Check the device vnode and update mount-from name, for local filesystems */
+ if (vfsp->vfc_vfsflags & VFC_VFSLOCALARGS) {
+ IMGSRC_DEBUG("Local, doing device validation.\n");
+
+ if (devpath != USER_ADDR_NULL) {
+ error = authorize_devpath_and_update_mntfromname(mp, devpath, &devvp, ctx);
+ if (error) {
+ IMGSRC_DEBUG("authorize_devpath_and_update_mntfromname() failed.\n");
+ goto out2;
}
- vnode_put(coveredvp);
- } else if (mp->mnt_flag & MNT_ROOTFS) {
- mount_lock_destroy(mp);
-#if CONFIG_MACF
- mac_mount_label_destroy(mp);
-#endif
- FREE_ZONE((caddr_t)mp, sizeof (struct mount), M_MOUNT);
- } else
- panic("dounmount: no coveredvp");
- }
- return (error);
-}
-void
-mount_dropcrossref(mount_t mp, vnode_t dp, int need_put)
-{
- vnode_lock(dp);
- mp->mnt_crossref--;
- if (mp->mnt_crossref < 0)
- panic("mount cross refs -ve");
- if (((dp->v_lflag & VL_MOUNTDEAD) == VL_MOUNTDEAD) && (mp->mnt_crossref == 0)) {
- dp->v_lflag &= ~VL_MOUNTDEAD;
- if (need_put)
- vnode_put_locked(dp);
- vnode_unlock(dp);
- mount_lock_destroy(mp);
-#if CONFIG_MACF
- mac_mount_label_destroy(mp);
-#endif
- FREE_ZONE((caddr_t)mp, sizeof (struct mount), M_MOUNT);
- return;
+ vnode_put(devvp);
}
- if (need_put)
- vnode_put_locked(dp);
- vnode_unlock(dp);
-}
+ }
+ /*
+ * Place mp on top of vnode, ref the vnode, call checkdirs(),
+ * and increment the name cache's mount generation
+ */
-/*
- * Sync each mounted filesystem.
- */
-#if DIAGNOSTIC
-int syncprt = 0;
-struct ctldebug debug0 = { "syncprt", &syncprt };
-#endif
+ IMGSRC_DEBUG("About to call place_mount_and_checkdirs().\n");
+ error = place_mount_and_checkdirs(mp, vp, ctx);
+ if (error != 0) {
+ goto out2;
+ }
-int print_vmpage_stat=0;
+ placed = TRUE;
-static int
-sync_callback(mount_t mp, __unused void * arg)
-{
- int asyncflag;
+ strlcpy(old_mntonname, mp->mnt_vfsstat.f_mntonname, MAXPATHLEN);
+ strlcpy(mp->mnt_vfsstat.f_mntonname, cnp->cn_pnbuf, MAXPATHLEN);
- if ((mp->mnt_flag & MNT_RDONLY) == 0) {
- asyncflag = mp->mnt_flag & MNT_ASYNC;
- mp->mnt_flag &= ~MNT_ASYNC;
- VFS_SYNC(mp, MNT_NOWAIT, vfs_context_current());
- if (asyncflag)
- mp->mnt_flag |= MNT_ASYNC;
+ /* Forbid future moves */
+ mount_lock(mp);
+ mp->mnt_kern_flag |= MNTK_HAS_MOVED;
+ mount_unlock(mp);
+
+ /* Finally, add to mount list, completely ready to go */
+ if (mount_list_add(mp) != 0) {
+ /*
+ * The system is shutting down trying to umount
+ * everything, so fail with a plausible errno.
+ */
+ error = EBUSY;
+ goto out3;
}
- return(VFS_RETURNED);
-}
+ mount_end_update(mp);
+ vnode_put(rvp);
+ zfree(ZV_NAMEI, old_mntonname);
-extern unsigned int vp_pagein, vp_pgodirty, vp_pgoclean;
-extern unsigned int dp_pgins, dp_pgouts;
+ vfs_notify_mount(pvp);
-/* ARGSUSED */
-int
-sync(__unused proc_t p, __unused struct sync_args *uap, __unused register_t *retval)
-{
+ return 0;
+out3:
+ strlcpy(mp->mnt_vfsstat.f_mntonname, old_mntonname, MAXPATHLEN);
- vfs_iterate(LK_NOWAIT, sync_callback, (void *)0);
- {
- if(print_vmpage_stat) {
- vm_countdirtypages();
- printf("VP: %d: %d: %d: %d: %d\n", vp_pgodirty, vp_pgoclean, vp_pagein,
- dp_pgins, dp_pgouts);
- }
- }
-#if DIAGNOSTIC
- if (syncprt)
- vfs_bufstats();
-#endif /* DIAGNOSTIC */
- return (0);
-}
+ mount_lock(mp);
+ mp->mnt_kern_flag &= ~(MNTK_HAS_MOVED);
+ mount_unlock(mp);
-/*
- * Change filesystem quotas.
- */
-#if QUOTA
-static int quotactl_funneled(proc_t p, struct quotactl_args *uap, register_t *retval);
+out2:
+ /*
+ * Placing the mp on the vnode clears VMOUNT,
+ * so cleanup is different after that point
+ */
+ if (placed) {
+ /* Rele the vp, clear VMOUNT and v_mountedhere */
+ undo_place_on_covered_vp(mp, vp);
+ } else {
+ vnode_lock_spin(vp);
+ CLR(vp->v_flag, VMOUNT);
+ vnode_unlock(vp);
+ }
+out1:
+ mount_end_update(mp);
-int
-quotactl(proc_t p, struct quotactl_args *uap, register_t *retval)
-{
- boolean_t funnel_state;
- int error;
-
- funnel_state = thread_funnel_set(kernel_flock, TRUE);
- error = quotactl_funneled(p, uap, retval);
- thread_funnel_set(kernel_flock, funnel_state);
- return(error);
+out0:
+ vnode_put(rvp);
+ zfree(ZV_NAMEI, old_mntonname);
+ return error;
}
-static int
-quotactl_funneled(proc_t p, struct quotactl_args *uap, __unused register_t *retval)
+#if CONFIG_LOCKERBOOT
+__private_extern__
+int
+mount_locker_protoboot(const char *fsname, const char *mntpoint,
+ const char *pbdevpath)
{
- struct mount *mp;
- int error, quota_cmd, quota_status;
- caddr_t datap;
- size_t fnamelen;
+ int error = -1;
struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
- struct dqblk my_dqblk;
+ boolean_t cleanup_nd = FALSE;
+ vfs_context_t ctx = vfs_context_kernel();
+ boolean_t is64 = TRUE;
+ boolean_t by_index = TRUE;
+ struct user64_mnt_imgsrc_args mia64 = {
+ .mi_height = 0,
+ .mi_flags = 0,
+ .mi_devpath = CAST_USER_ADDR_T(pbdevpath),
+ };
+ user_addr_t mia64addr = CAST_USER_ADDR_T(&mia64);
- AUDIT_ARG(uid, uap->uid, 0, 0, 0);
- AUDIT_ARG(cmd, uap->cmd);
- NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
+ NDINIT(&nd, LOOKUP, OP_MOUNT, FOLLOW | AUDITVNPATH1 | WANTPARENT,
+ UIO_SYSSPACE, CAST_USER_ADDR_T(mntpoint), ctx);
error = namei(&nd);
- if (error)
- return (error);
- mp = nd.ni_vp->v_mount;
- vnode_put(nd.ni_vp);
- nameidone(&nd);
+ if (error) {
+ IMGSRC_DEBUG("namei: %d\n", error);
+ goto out;
+ }
- /* copyin any data we will need for downstream code */
- quota_cmd = uap->cmd >> SUBCMDSHIFT;
+ cleanup_nd = TRUE;
+ error = relocate_imageboot_source(nd.ni_dvp, nd.ni_vp,
+ &nd.ni_cnd, fsname, ctx, is64, mia64addr, by_index);
- switch (quota_cmd) {
- case Q_QUOTAON:
- /* uap->arg specifies a file from which to take the quotas */
- fnamelen = MAXPATHLEN;
- datap = kalloc(MAXPATHLEN);
- error = copyinstr(uap->arg, datap, MAXPATHLEN, &fnamelen);
- break;
- case Q_GETQUOTA:
- /* uap->arg is a pointer to a dqblk structure. */
- datap = (caddr_t) &my_dqblk;
- break;
- case Q_SETQUOTA:
- case Q_SETUSE:
- /* uap->arg is a pointer to a dqblk structure. */
- datap = (caddr_t) &my_dqblk;
- if (proc_is64bit(p)) {
- struct user_dqblk my_dqblk64;
- error = copyin(uap->arg, (caddr_t)&my_dqblk64, sizeof (my_dqblk64));
- if (error == 0) {
- munge_dqblk(&my_dqblk, &my_dqblk64, FALSE);
- }
- }
- else {
- error = copyin(uap->arg, (caddr_t)&my_dqblk, sizeof (my_dqblk));
- }
- break;
- case Q_QUOTASTAT:
- /* uap->arg is a pointer to an integer */
- datap = (caddr_t) "a_status;
- break;
- default:
- datap = NULL;
- break;
- } /* switch */
+out:
+ if (cleanup_nd) {
+ int stashed = error;
- if (error == 0) {
- error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, datap, ctx);
- }
+ error = vnode_put(nd.ni_vp);
+ if (error) {
+ panic("vnode_put() returned non-zero: %d", error);
+ }
- switch (quota_cmd) {
- case Q_QUOTAON:
- if (datap != NULL)
- kfree(datap, MAXPATHLEN);
- break;
- case Q_GETQUOTA:
- /* uap->arg is a pointer to a dqblk structure we need to copy out to */
- if (error == 0) {
- if (proc_is64bit(p)) {
- struct user_dqblk my_dqblk64;
- munge_dqblk(&my_dqblk, &my_dqblk64, TRUE);
- error = copyout((caddr_t)&my_dqblk64, uap->arg, sizeof (my_dqblk64));
- }
- else {
- error = copyout(datap, uap->arg, sizeof (struct dqblk));
+ if (nd.ni_dvp) {
+ error = vnode_put(nd.ni_dvp);
+ if (error) {
+ panic("vnode_put() returned non-zero: %d", error);
}
}
- break;
- case Q_QUOTASTAT:
- /* uap->arg is a pointer to an integer */
- if (error == 0) {
- error = copyout(datap, uap->arg, sizeof(quota_status));
- }
- break;
- default:
- break;
- } /* switch */
+ nameidone(&nd);
- return (error);
-}
-#else
-int
-quotactl(__unused proc_t p, __unused struct quotactl_args *uap, __unused register_t *retval)
-{
- return (EOPNOTSUPP);
+ error = stashed;
+ }
+ return error;
}
-#endif /* QUOTA */
+#endif /* CONFIG_LOCKERBOOT */
+#endif /* CONFIG_IMGSRC_ACCESS */
-/*
- * Get filesystem statistics.
- *
- * Returns: 0 Success
- * namei:???
- * vfs_update_vfsstat:???
- * munge_statfs:EFAULT
- */
-/* ARGSUSED */
-int
-statfs(__unused proc_t p, struct statfs_args *uap, __unused register_t *retval)
+void
+enablequotas(struct mount *mp, vfs_context_t ctx)
{
- struct mount *mp;
- struct vfsstatfs *sp;
- int error;
- struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
- vnode_t vp;
-
- NDINIT(&nd, LOOKUP, NOTRIGGER | FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- error = namei(&nd);
- if (error)
- return (error);
- vp = nd.ni_vp;
- mp = vp->v_mount;
- sp = &mp->mnt_vfsstat;
- nameidone(&nd);
+ struct nameidata qnd;
+ int type;
+ char qfpath[MAXPATHLEN];
+ const char *qfname = QUOTAFILENAME;
+ const char *qfopsname = QUOTAOPSNAME;
+ const char *qfextension[] = INITQFNAMES;
- error = vfs_update_vfsstat(mp, ctx, VFS_USER_EVENT);
- vnode_put(vp);
- if (error != 0)
- return (error);
+ /* XXX Shoulkd be an MNTK_ flag, instead of strncmp()'s */
+ if (strncmp(mp->mnt_vfsstat.f_fstypename, "hfs", sizeof("hfs")) != 0) {
+ return;
+ }
+ /*
+ * Enable filesystem disk quotas if necessary.
+ * We ignore errors as this should not interfere with final mount
+ */
+ for (type = 0; type < MAXQUOTAS; type++) {
+ snprintf(qfpath, sizeof(qfpath), "%s/%s.%s", mp->mnt_vfsstat.f_mntonname, qfopsname, qfextension[type]);
+ NDINIT(&qnd, LOOKUP, OP_MOUNT, FOLLOW, UIO_SYSSPACE,
+ CAST_USER_ADDR_T(qfpath), ctx);
+ if (namei(&qnd) != 0) {
+ continue; /* option file to trigger quotas is not present */
+ }
+ vnode_put(qnd.ni_vp);
+ nameidone(&qnd);
+ snprintf(qfpath, sizeof(qfpath), "%s/%s.%s", mp->mnt_vfsstat.f_mntonname, qfname, qfextension[type]);
- error = munge_statfs(mp, sp, uap->buf, NULL, IS_64BIT_PROCESS(p), TRUE);
- return (error);
+ (void) VFS_QUOTACTL(mp, QCMD(Q_QUOTAON, type), 0, qfpath, ctx);
+ }
+ return;
}
-/*
- * Get filesystem statistics.
- */
-/* ARGSUSED */
-int
-fstatfs(__unused proc_t p, struct fstatfs_args *uap, __unused register_t *retval)
-{
- vnode_t vp;
- struct mount *mp;
- struct vfsstatfs *sp;
- int error;
- AUDIT_ARG(fd, uap->fd);
+static int
+checkdirs_callback(proc_t p, void * arg)
+{
+ struct cdirargs * cdrp = (struct cdirargs *)arg;
+ vnode_t olddp = cdrp->olddp;
+ vnode_t newdp = cdrp->newdp;
+ struct filedesc *fdp;
+ vnode_t new_cvp = newdp;
+ vnode_t new_rvp = newdp;
+ vnode_t old_cvp = NULL;
+ vnode_t old_rvp = NULL;
- if ( (error = file_vnode(uap->fd, &vp)) )
- return (error);
+ /*
+ * XXX Also needs to iterate each thread in the process to see if it
+ * XXX is using a per-thread current working directory, and, if so,
+ * XXX update that as well.
+ */
- AUDIT_ARG(vnpath_withref, vp, ARG_VNODE1);
+ /*
+ * First, with the proc_fdlock held, check to see if we will need
+ * to do any work. If not, we will get out fast.
+ */
+ proc_fdlock(p);
+ fdp = p->p_fd;
+ if (fdp == NULL ||
+ (fdp->fd_cdir != olddp && fdp->fd_rdir != olddp)) {
+ proc_fdunlock(p);
+ return PROC_RETURNED;
+ }
+ proc_fdunlock(p);
- mp = vp->v_mount;
- if (!mp) {
- file_drop(uap->fd);
- return (EBADF);
+ /*
+ * Ok, we will have to do some work. Always take two refs
+ * because we might need that many. We'll dispose of whatever
+ * we ended up not using.
+ */
+ if (vnode_ref(newdp) != 0) {
+ return PROC_RETURNED;
}
- sp = &mp->mnt_vfsstat;
- if ((error = vfs_update_vfsstat(mp,vfs_context_current(),VFS_USER_EVENT)) != 0) {
- file_drop(uap->fd);
- return (error);
+ if (vnode_ref(newdp) != 0) {
+ vnode_rele(newdp);
+ return PROC_RETURNED;
}
- file_drop(uap->fd);
- error = munge_statfs(mp, sp, uap->buf, NULL, IS_64BIT_PROCESS(p), TRUE);
+ proc_dirs_lock_exclusive(p);
+ /*
+ * Now do the work. Note: we dropped the proc_fdlock, so we
+ * have to do all of the checks again.
+ */
+ proc_fdlock(p);
+ fdp = p->p_fd;
+ if (fdp != NULL) {
+ if (fdp->fd_cdir == olddp) {
+ old_cvp = olddp;
+ fdp->fd_cdir = newdp;
+ new_cvp = NULL;
+ }
+ if (fdp->fd_rdir == olddp) {
+ old_rvp = olddp;
+ fdp->fd_rdir = newdp;
+ new_rvp = NULL;
+ }
+ }
+ proc_fdunlock(p);
+ proc_dirs_unlock_exclusive(p);
+
+ /*
+ * Dispose of any references that are no longer needed.
+ */
+ if (old_cvp != NULL) {
+ vnode_rele(old_cvp);
+ }
+ if (old_rvp != NULL) {
+ vnode_rele(old_rvp);
+ }
+ if (new_cvp != NULL) {
+ vnode_rele(new_cvp);
+ }
+ if (new_rvp != NULL) {
+ vnode_rele(new_rvp);
+ }
- return (error);
+ return PROC_RETURNED;
}
-/*
- * Common routine to handle copying of statfs64 data to user space
+
+
+/*
+ * Scan all active processes to see if any of them have a current
+ * or root directory onto which the new filesystem has just been
+ * mounted. If so, replace them with the new mount point.
*/
-static int
-statfs64_common(struct mount *mp, struct vfsstatfs *sfsp, user_addr_t bufp)
+static int
+checkdirs(vnode_t olddp, vfs_context_t ctx)
{
- int error;
- struct statfs64 sfs;
-
- bzero(&sfs, sizeof(sfs));
-
- sfs.f_bsize = sfsp->f_bsize;
- sfs.f_iosize = (int32_t)sfsp->f_iosize;
- sfs.f_blocks = sfsp->f_blocks;
- sfs.f_bfree = sfsp->f_bfree;
- sfs.f_bavail = sfsp->f_bavail;
- sfs.f_files = sfsp->f_files;
- sfs.f_ffree = sfsp->f_ffree;
- sfs.f_fsid = sfsp->f_fsid;
- sfs.f_owner = sfsp->f_owner;
- sfs.f_type = mp->mnt_vtable->vfc_typenum;
- sfs.f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
- sfs.f_fssubtype = sfsp->f_fssubtype;
- strlcpy(&sfs.f_fstypename[0], &sfsp->f_fstypename[0], MFSTYPENAMELEN);
- strlcpy(&sfs.f_mntonname[0], &sfsp->f_mntonname[0], MAXPATHLEN);
- strlcpy(&sfs.f_mntfromname[0], &sfsp->f_mntfromname[0], MAXPATHLEN);
-
- error = copyout((caddr_t)&sfs, bufp, sizeof(sfs));
-
- return(error);
-}
-
-/*
- * Get file system statistics in 64-bit mode
+ vnode_t newdp;
+ vnode_t tvp;
+ int err;
+ struct cdirargs cdr;
+
+ if (olddp->v_usecount == 1) {
+ return 0;
+ }
+ err = VFS_ROOT(olddp->v_mountedhere, &newdp, ctx);
+
+ if (err != 0) {
+#if DIAGNOSTIC
+ panic("mount: lost mount: error %d", err);
+#endif
+ return err;
+ }
+
+ cdr.olddp = olddp;
+ cdr.newdp = newdp;
+ /* do not block for exec/fork trans as the vp in cwd & rootdir are not changing */
+ proc_iterate(PROC_ALLPROCLIST | PROC_NOWAITTRANS, checkdirs_callback, (void *)&cdr, NULL, NULL);
+
+ if (rootvnode == olddp) {
+ vnode_ref(newdp);
+ lck_rw_lock_exclusive(rootvnode_rw_lock);
+ tvp = rootvnode;
+ rootvnode = newdp;
+ lck_rw_unlock_exclusive(rootvnode_rw_lock);
+ vnode_rele(tvp);
+ }
+
+ vnode_put(newdp);
+ return 0;
+}
+
+/*
+ * Unmount a file system.
+ *
+ * Note: unmount takes a path to the vnode mounted on as argument,
+ * not special file (as before).
*/
+/* ARGSUSED */
int
-statfs64(__unused struct proc *p, struct statfs64_args *uap, __unused register_t *retval)
+unmount(__unused proc_t p, struct unmount_args *uap, __unused int32_t *retval)
{
+ vnode_t vp;
struct mount *mp;
- struct vfsstatfs *sp;
int error;
struct nameidata nd;
- vfs_context_t ctxp = vfs_context_current();
- vnode_t vp;
+ vfs_context_t ctx = vfs_context_current();
- NDINIT(&nd, LOOKUP, NOTRIGGER | FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctxp);
+ NDINIT(&nd, LOOKUP, OP_UNMOUNT, FOLLOW | AUDITVNPATH1,
+ UIO_USERSPACE, uap->path, ctx);
error = namei(&nd);
- if (error)
- return (error);
+ if (error) {
+ return error;
+ }
vp = nd.ni_vp;
mp = vp->v_mount;
- sp = &mp->mnt_vfsstat;
nameidone(&nd);
- error = vfs_update_vfsstat(mp, ctxp, VFS_USER_EVENT);
+#if CONFIG_MACF
+ error = mac_mount_check_umount(ctx, mp);
+ if (error != 0) {
+ vnode_put(vp);
+ return error;
+ }
+#endif
+ /*
+ * Must be the root of the filesystem
+ */
+ if ((vp->v_flag & VROOT) == 0) {
+ vnode_put(vp);
+ return EINVAL;
+ }
+ mount_ref(mp, 0);
vnode_put(vp);
- if (error != 0)
- return (error);
-
- error = statfs64_common(mp, sp, uap->buf);
-
- return (error);
+ /* safedounmount consumes the mount ref */
+ return safedounmount(mp, uap->flags, ctx);
}
-/*
- * Get file system statistics in 64-bit mode
- */
int
-fstatfs64(__unused struct proc *p, struct fstatfs64_args *uap, __unused register_t *retval)
+vfs_unmountbyfsid(fsid_t *fsid, int flags, vfs_context_t ctx)
{
- struct vnode *vp;
- struct mount *mp;
- struct vfsstatfs *sp;
- int error;
-
- AUDIT_ARG(fd, uap->fd);
-
- if ( (error = file_vnode(uap->fd, &vp)) )
- return (error);
-
- AUDIT_ARG(vnpath_withref, vp, ARG_VNODE1);
+ mount_t mp;
- mp = vp->v_mount;
- if (!mp) {
- file_drop(uap->fd);
- return (EBADF);
- }
- sp = &mp->mnt_vfsstat;
- if ((error = vfs_update_vfsstat(mp, vfs_context_current(), VFS_USER_EVENT)) != 0) {
- file_drop(uap->fd);
- return (error);
+ mp = mount_list_lookupby_fsid(fsid, 0, 1);
+ if (mp == (mount_t)0) {
+ return ENOENT;
}
- file_drop(uap->fd);
-
- error = statfs64_common(mp, sp, uap->buf);
-
- return (error);
+ mount_ref(mp, 0);
+ mount_iterdrop(mp);
+ /* safedounmount consumes the mount ref */
+ return safedounmount(mp, flags, ctx);
}
-struct getfsstat_struct {
- user_addr_t sfsp;
- user_addr_t *mp;
- int count;
- int maxcount;
- int flags;
- int error;
-};
+#define ROLE_ACCOUNT_UNMOUNT_ENTITLEMENT \
+ "com.apple.private.vfs.role-account-unmount"
-
-static int
-getfsstat_callback(mount_t mp, void * arg)
+/*
+ * The mount struct comes with a mount ref which will be consumed.
+ * Do the actual file system unmount, prevent some common foot shooting.
+ */
+int
+safedounmount(struct mount *mp, int flags, vfs_context_t ctx)
{
-
- struct getfsstat_struct *fstp = (struct getfsstat_struct *)arg;
- struct vfsstatfs *sp;
- int error, my_size;
- vfs_context_t ctx = vfs_context_current();
+ int error;
+ proc_t p = vfs_context_proc(ctx);
- if (fstp->sfsp && fstp->count < fstp->maxcount) {
- sp = &mp->mnt_vfsstat;
- /*
- * If MNT_NOWAIT is specified, do not refresh the
- * fsstat cache. MNT_WAIT overrides MNT_NOWAIT.
- */
- if (((fstp->flags & MNT_NOWAIT) == 0 || (fstp->flags & MNT_WAIT)) &&
- (error = vfs_update_vfsstat(mp, ctx,
- VFS_USER_EVENT))) {
- KAUTH_DEBUG("vfs_update_vfsstat returned %d", error);
- return(VFS_RETURNED);
- }
+ /*
+ * If the file system is not responding and MNT_NOBLOCK
+ * is set and not a forced unmount then return EBUSY.
+ */
+ if ((mp->mnt_kern_flag & MNT_LNOTRESP) &&
+ (flags & MNT_NOBLOCK) && ((flags & MNT_FORCE) == 0)) {
+ error = EBUSY;
+ goto out;
+ }
+ /*
+ * Skip authorization in two cases:
+ * - If the process running the unmount has ROLE_ACCOUNT_UNMOUNT_ENTITLEMENT.
+ * This entitlement allows non-root processes unmount volumes mounted by
+ * other processes.
+ * - If the mount is tagged as permissive and this is not a forced-unmount
+ * attempt.
+ */
+ if (!IOTaskHasEntitlement(current_task(), ROLE_ACCOUNT_UNMOUNT_ENTITLEMENT) &&
+ (!(((mp->mnt_kern_flag & MNTK_PERMIT_UNMOUNT) != 0) && ((flags & MNT_FORCE) == 0)))) {
/*
- * Need to handle LP64 version of struct statfs
+ * Only root, or the user that did the original mount is
+ * permitted to unmount this filesystem.
*/
- error = munge_statfs(mp, sp, fstp->sfsp, &my_size, IS_64BIT_PROCESS(vfs_context_proc(ctx)), FALSE);
- if (error) {
- fstp->error = error;
- return(VFS_RETURNED_DONE);
+ if ((mp->mnt_vfsstat.f_owner != kauth_cred_getuid(kauth_cred_get())) &&
+ (error = suser(kauth_cred_get(), &p->p_acflag))) {
+ goto out;
}
- fstp->sfsp += my_size;
+ }
+ /*
+ * Don't allow unmounting the root file system, or other volumes
+ * associated with it (for example, the associated VM or DATA mounts) .
+ */
+ if ((mp->mnt_flag & MNT_ROOTFS) || (mp->mnt_kern_flag & MNTK_SYSTEM)) {
+ error = EBUSY; /* the root (or associated volumes) is always busy */
+ goto out;
+ }
- if (fstp->mp) {
- error = mac_mount_label_get(mp, *fstp->mp);
- if (error) {
- fstp->error = error;
- return(VFS_RETURNED_DONE);
- }
- fstp->mp++;
- }
+ /*
+ * If the mount is providing the root filesystem's disk image
+ * (i.e. imageboot), don't allow unmounting
+ */
+ if (mp->mnt_kern_flag & MNTK_BACKS_ROOT) {
+ error = EBUSY;
+ goto out;
}
- fstp->count++;
- return(VFS_RETURNED);
+
+ return dounmount(mp, flags, 1, ctx);
+
+out:
+ mount_drop(mp, 0);
+ return error;
}
/*
- * Get statistics on all filesystems.
+ * Do the actual file system unmount.
*/
int
-getfsstat(__unused proc_t p, struct getfsstat_args *uap, int *retval)
+dounmount(struct mount *mp, int flags, int withref, vfs_context_t ctx)
{
- struct __mac_getfsstat_args muap;
+ vnode_t coveredvp = (vnode_t)0;
+ int error;
+ int needwakeup = 0;
+ int forcedunmount = 0;
+ int lflags = 0;
+ struct vnode *devvp = NULLVP;
+#if CONFIG_TRIGGERS
+ proc_t p = vfs_context_proc(ctx);
+ int did_vflush = 0;
+ int pflags_save = 0;
+#endif /* CONFIG_TRIGGERS */
- muap.buf = uap->buf;
- muap.bufsize = uap->bufsize;
- muap.mac = USER_ADDR_NULL;
- muap.macsize = 0;
- muap.flags = uap->flags;
+#if CONFIG_FSE
+ if (!(flags & MNT_FORCE)) {
+ fsevent_unmount(mp, ctx); /* has to come first! */
+ }
+#endif
- return (__mac_getfsstat(p, &muap, retval));
-}
+ mount_lock(mp);
-int
-__mac_getfsstat(__unused proc_t p, struct __mac_getfsstat_args *uap, int *retval)
-{
- user_addr_t sfsp;
- user_addr_t *mp;
- int count, maxcount;
- struct getfsstat_struct fst;
+ /*
+ * If already an unmount in progress just return EBUSY.
+ * Even a forced unmount cannot override.
+ */
+ if (mp->mnt_lflag & (MNT_LUNMOUNT | MNT_LMOUNT)) {
+ if (withref != 0) {
+ mount_drop(mp, 1);
+ }
+ mount_unlock(mp);
+ return EBUSY;
+ }
- if (IS_64BIT_PROCESS(p)) {
- maxcount = uap->bufsize / sizeof(struct user_statfs);
+ if (flags & MNT_FORCE) {
+ forcedunmount = 1;
+ mp->mnt_lflag |= MNT_LFORCE;
}
- else {
- maxcount = uap->bufsize / sizeof(struct statfs);
+
+#if CONFIG_TRIGGERS
+ if (flags & MNT_NOBLOCK && p != kernproc) {
+ pflags_save = OSBitOrAtomic(P_NOREMOTEHANG, &p->p_flag);
}
- sfsp = uap->buf;
- count = 0;
+#endif
- mp = NULL;
+ mp->mnt_kern_flag |= MNTK_UNMOUNT;
+ mp->mnt_lflag |= MNT_LUNMOUNT;
+ mp->mnt_flag &= ~MNT_ASYNC;
+ /*
+ * anyone currently in the fast path that
+ * trips over the cached rootvp will be
+ * dumped out and forced into the slow path
+ * to regenerate a new cached value
+ */
+ mp->mnt_realrootvp = NULLVP;
+ mount_unlock(mp);
-#if CONFIG_MACF
- if (uap->mac != USER_ADDR_NULL) {
- u_int32_t *mp0;
- int error;
- int i;
+ if (forcedunmount && (flags & MNT_LNOSUB) == 0) {
+ /*
+ * Force unmount any mounts in this filesystem.
+ * If any unmounts fail - just leave them dangling.
+ * Avoids recursion.
+ */
+ (void) dounmount_submounts(mp, flags | MNT_LNOSUB, ctx);
+ }
- count = (int)(uap->macsize / (IS_64BIT_PROCESS(p) ? 8 : 4));
- if (count != maxcount)
- return (EINVAL);
+ /*
+ * taking the name_cache_lock exclusively will
+ * insure that everyone is out of the fast path who
+ * might be trying to use a now stale copy of
+ * vp->v_mountedhere->mnt_realrootvp
+ * bumping mount_generation causes the cached values
+ * to be invalidated
+ */
+ name_cache_lock();
+ mount_generation++;
+ name_cache_unlock();
- /* Copy in the array */
- MALLOC(mp0, u_int32_t *, uap->macsize, M_MACTEMP, M_WAITOK);
- error = copyin(uap->mac, mp0, uap->macsize);
- if (error)
- return (error);
- /* Normalize to an array of user_addr_t */
- MALLOC(mp, user_addr_t *, count * sizeof(user_addr_t), M_MACTEMP, M_WAITOK);
- for (i = 0; i < count; i++) {
- if (IS_64BIT_PROCESS(p))
- mp[i] = ((user_addr_t *)mp0)[i];
- else
- mp[i] = (user_addr_t)mp0[i];
+ lck_rw_lock_exclusive(&mp->mnt_rwlock);
+ if (withref != 0) {
+ mount_drop(mp, 0);
+ }
+ error = 0;
+ if (forcedunmount == 0) {
+ ubc_umount(mp); /* release cached vnodes */
+ if ((mp->mnt_flag & MNT_RDONLY) == 0) {
+ error = VFS_SYNC(mp, MNT_WAIT, ctx);
+ if (error) {
+ mount_lock(mp);
+ mp->mnt_kern_flag &= ~MNTK_UNMOUNT;
+ mp->mnt_lflag &= ~MNT_LUNMOUNT;
+ mp->mnt_lflag &= ~MNT_LFORCE;
+ goto out;
+ }
}
- FREE(mp0, M_MACTEMP);
}
+
+ IOBSDMountChange(mp, kIOMountChangeUnmount);
+
+#if CONFIG_TRIGGERS
+ vfs_nested_trigger_unmounts(mp, flags, ctx);
+ did_vflush = 1;
#endif
+ if (forcedunmount) {
+ lflags |= FORCECLOSE;
+ }
+ error = vflush(mp, NULLVP, SKIPSWAP | SKIPSYSTEM | SKIPROOT | lflags);
+ if ((forcedunmount == 0) && error) {
+ mount_lock(mp);
+ mp->mnt_kern_flag &= ~MNTK_UNMOUNT;
+ mp->mnt_lflag &= ~MNT_LUNMOUNT;
+ mp->mnt_lflag &= ~MNT_LFORCE;
+ goto out;
+ }
+ /* make sure there are no one in the mount iterations or lookup */
+ mount_iterdrain(mp);
- fst.sfsp = sfsp;
- fst.mp = mp;
- fst.flags = uap->flags;
- fst.count = 0;
- fst.error = 0;
- fst.maxcount = maxcount;
+ error = VFS_UNMOUNT(mp, flags, ctx);
+ if (error) {
+ mount_iterreset(mp);
+ mount_lock(mp);
+ mp->mnt_kern_flag &= ~MNTK_UNMOUNT;
+ mp->mnt_lflag &= ~MNT_LUNMOUNT;
+ mp->mnt_lflag &= ~MNT_LFORCE;
+ goto out;
+ }
+
+ /* increment the operations count */
+ if (!error) {
+ OSAddAtomic(1, &vfs_nummntops);
+ }
+
+ if (mp->mnt_devvp && mp->mnt_vtable->vfc_vfsflags & VFC_VFSLOCALARGS) {
+ /* hold an io reference and drop the usecount before close */
+ devvp = mp->mnt_devvp;
+ vnode_getalways(devvp);
+ vnode_rele(devvp);
+ VNOP_CLOSE(devvp, mp->mnt_flag & MNT_RDONLY ? FREAD : FREAD | FWRITE,
+ ctx);
+ vnode_clearmountedon(devvp);
+ vnode_put(devvp);
+ }
+ lck_rw_done(&mp->mnt_rwlock);
+ mount_list_remove(mp);
+ lck_rw_lock_exclusive(&mp->mnt_rwlock);
-
- vfs_iterate(0, getfsstat_callback, &fst);
+ /* mark the mount point hook in the vp but not drop the ref yet */
+ if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) {
+ /*
+ * The covered vnode needs special handling. Trying to get an
+ * iocount must not block here as this may lead to deadlocks
+ * if the Filesystem to which the covered vnode belongs is
+ * undergoing forced unmounts. Since we hold a usecount, the
+ * vnode cannot be reused (it can, however, still be terminated)
+ */
+ vnode_getalways(coveredvp);
+ vnode_lock_spin(coveredvp);
- if (mp)
- FREE(mp, M_MACTEMP);
+ mp->mnt_crossref++;
+ coveredvp->v_mountedhere = (struct mount *)0;
+ CLR(coveredvp->v_flag, VMOUNT);
- if (fst.error ) {
- KAUTH_DEBUG("ERROR - %s gets %d", p->p_comm, fst.error);
- return(fst.error);
+ vnode_unlock(coveredvp);
+ vnode_put(coveredvp);
}
- if (fst.sfsp && fst.count > fst.maxcount)
- *retval = fst.maxcount;
- else
- *retval = fst.count;
- return (0);
-}
+ mount_list_lock();
+ mp->mnt_vtable->vfc_refcount--;
+ mount_list_unlock();
-static int
-getfsstat64_callback(mount_t mp, void * arg)
-{
- struct getfsstat_struct *fstp = (struct getfsstat_struct *)arg;
- struct vfsstatfs *sp;
- int error;
+ cache_purgevfs(mp); /* remove cache entries for this file sys */
+ vfs_event_signal(NULL, VQ_UNMOUNT, (intptr_t)NULL);
+ mount_lock(mp);
+ mp->mnt_lflag |= MNT_LDEAD;
- if (fstp->sfsp && fstp->count < fstp->maxcount) {
- sp = &mp->mnt_vfsstat;
+ if (mp->mnt_lflag & MNT_LWAIT) {
/*
- * If MNT_NOWAIT is specified, do not refresh the
- * fsstat cache. MNT_WAIT overrides MNT_NOWAIT.
+ * do the wakeup here
+ * in case we block in mount_refdrain
+ * which will drop the mount lock
+ * and allow anyone blocked in vfs_busy
+ * to wakeup and see the LDEAD state
*/
- if (((fstp->flags & MNT_NOWAIT) == 0 || (fstp->flags & MNT_WAIT)) &&
- (error = vfs_update_vfsstat(mp, vfs_context_current(), VFS_USER_EVENT))) {
- KAUTH_DEBUG("vfs_update_vfsstat returned %d", error);
- return(VFS_RETURNED);
- }
-
- error = statfs64_common(mp, sp, fstp->sfsp);
- if (error) {
- fstp->error = error;
- return(VFS_RETURNED_DONE);
- }
- fstp->sfsp += sizeof(struct statfs64);
+ mp->mnt_lflag &= ~MNT_LWAIT;
+ wakeup((caddr_t)mp);
}
- fstp->count++;
- return(VFS_RETURNED);
-}
+ mount_refdrain(mp);
-/*
- * Get statistics on all file systems in 64 bit mode.
- */
-int
-getfsstat64(__unused proc_t p, struct getfsstat64_args *uap, int *retval)
-{
- user_addr_t sfsp;
- int count, maxcount;
- struct getfsstat_struct fst;
+ /* free disk_conditioner_info structure for this mount */
+ disk_conditioner_unmount(mp);
- maxcount = uap->bufsize / sizeof(struct statfs64);
+out:
+ if (mp->mnt_lflag & MNT_LWAIT) {
+ mp->mnt_lflag &= ~MNT_LWAIT;
+ needwakeup = 1;
+ }
- sfsp = uap->buf;
- count = 0;
+#if CONFIG_TRIGGERS
+ if (flags & MNT_NOBLOCK && p != kernproc) {
+ // Restore P_NOREMOTEHANG bit to its previous value
+ if ((pflags_save & P_NOREMOTEHANG) == 0) {
+ OSBitAndAtomic(~((uint32_t) P_NOREMOTEHANG), &p->p_flag);
+ }
+ }
- fst.sfsp = sfsp;
- fst.flags = uap->flags;
- fst.count = 0;
- fst.error = 0;
- fst.maxcount = maxcount;
+ /*
+ * Callback and context are set together under the mount lock, and
+ * never cleared, so we're safe to examine them here, drop the lock,
+ * and call out.
+ */
+ if (mp->mnt_triggercallback != NULL) {
+ mount_unlock(mp);
+ if (error == 0) {
+ mp->mnt_triggercallback(mp, VTC_RELEASE, mp->mnt_triggerdata, ctx);
+ } else if (did_vflush) {
+ mp->mnt_triggercallback(mp, VTC_REPLACE, mp->mnt_triggerdata, ctx);
+ }
+ } else {
+ mount_unlock(mp);
+ }
+#else
+ mount_unlock(mp);
+#endif /* CONFIG_TRIGGERS */
- vfs_iterate(0, getfsstat64_callback, &fst);
+ lck_rw_done(&mp->mnt_rwlock);
- if (fst.error ) {
- KAUTH_DEBUG("ERROR - %s gets %d", p->p_comm, fst.error);
- return(fst.error);
+ if (needwakeup) {
+ wakeup((caddr_t)mp);
}
- if (fst.sfsp && fst.count > fst.maxcount)
- *retval = fst.maxcount;
- else
- *retval = fst.count;
+ if (!error) {
+ if ((coveredvp != NULLVP)) {
+ vnode_t pvp = NULLVP;
- return (0);
-}
+ /*
+ * The covered vnode needs special handling. Trying to
+ * get an iocount must not block here as this may lead
+ * to deadlocks if the Filesystem to which the covered
+ * vnode belongs is undergoing forced unmounts. Since we
+ * hold a usecount, the vnode cannot be reused
+ * (it can, however, still be terminated).
+ */
+ vnode_getalways(coveredvp);
-#if COMPAT_GETFSSTAT
-ogetfsstat(proc_t p, struct getfsstat_args *uap, register_t *retval)
-{
- return (ENOTSUP);
-}
+ mount_dropcrossref(mp, coveredvp, 0);
+ /*
+ * We'll _try_ to detect if this really needs to be
+ * done. The coveredvp can only be in termination (or
+ * terminated) if the coveredvp's mount point is in a
+ * forced unmount (or has been) since we still hold the
+ * ref.
+ */
+ if (!vnode_isrecycled(coveredvp)) {
+ pvp = vnode_getparent(coveredvp);
+#if CONFIG_TRIGGERS
+ if (coveredvp->v_resolve) {
+ vnode_trigger_rearm(coveredvp, ctx);
+ }
+#endif
+ }
+
+ vnode_rele(coveredvp);
+ vnode_put(coveredvp);
+ coveredvp = NULLVP;
+
+ if (pvp) {
+ lock_vnode_and_post(pvp, NOTE_WRITE);
+ vnode_put(pvp);
+ }
+ } else if (mp->mnt_flag & MNT_ROOTFS) {
+ mount_lock_destroy(mp);
+#if CONFIG_MACF
+ mac_mount_label_destroy(mp);
#endif
+ zfree(mount_zone, mp);
+ } else {
+ panic("dounmount: no coveredvp");
+ }
+ }
+ return error;
+}
/*
- * Change current working directory to a given file descriptor.
+ * Unmount any mounts in this filesystem.
*/
-/* ARGSUSED */
-static int
-common_fchdir(proc_t p, struct fchdir_args *uap, int per_thread)
+void
+dounmount_submounts(struct mount *mp, int flags, vfs_context_t ctx)
{
- struct filedesc *fdp = p->p_fd;
+ mount_t smp;
+ fsid_t *fsids, fsid;
+ int fsids_sz;
+ int count = 0, i, m = 0;
vnode_t vp;
- vnode_t tdp;
- vnode_t tvp;
- struct mount *mp;
- int error;
- vfs_context_t ctx = vfs_context_current();
- if (per_thread && uap->fd == -1) {
- /*
- * Switching back from per-thread to per process CWD; verify we
- * in fact have one before proceeding. The only success case
- * for this code path is to return 0 preemptively after zapping
- * the thread structure contents.
- */
- thread_t th = vfs_context_thread(ctx);
- if (th) {
- uthread_t uth = get_bsdthread_info(th);
- tvp = uth->uu_cdir;
- uth->uu_cdir = NULLVP;
- if (tvp != NULLVP) {
- vnode_rele(tvp);
- return (0);
+ mount_list_lock();
+
+ // Get an array to hold the submounts fsids.
+ TAILQ_FOREACH(smp, &mountlist, mnt_list)
+ count++;
+ fsids_sz = count * sizeof(fsid_t);
+ fsids = kheap_alloc(KHEAP_TEMP, fsids_sz, Z_NOWAIT);
+ if (fsids == NULL) {
+ mount_list_unlock();
+ goto out;
+ }
+ fsids[0] = mp->mnt_vfsstat.f_fsid; // Prime the pump
+
+ /*
+ * Fill the array with submount fsids.
+ * Since mounts are always added to the tail of the mount list, the
+ * list is always in mount order.
+ * For each mount check if the mounted-on vnode belongs to a
+ * mount that's already added to our array of mounts to be unmounted.
+ */
+ for (smp = TAILQ_NEXT(mp, mnt_list); smp; smp = TAILQ_NEXT(smp, mnt_list)) {
+ vp = smp->mnt_vnodecovered;
+ if (vp == NULL) {
+ continue;
+ }
+ fsid = vnode_mount(vp)->mnt_vfsstat.f_fsid; // Underlying fsid
+ for (i = 0; i <= m; i++) {
+ if (fsids[i].val[0] == fsid.val[0] &&
+ fsids[i].val[1] == fsid.val[1]) {
+ fsids[++m] = smp->mnt_vfsstat.f_fsid;
+ break;
}
}
- return (EBADF);
}
+ mount_list_unlock();
- if ( (error = file_vnode(uap->fd, &vp)) )
- return(error);
- if ( (error = vnode_getwithref(vp)) ) {
- file_drop(uap->fd);
- return(error);
+ // Unmount the submounts in reverse order. Ignore errors.
+ for (i = m; i > 0; i--) {
+ smp = mount_list_lookupby_fsid(&fsids[i], 0, 1);
+ if (smp) {
+ mount_ref(smp, 0);
+ mount_iterdrop(smp);
+ (void) dounmount(smp, flags, 1, ctx);
+ }
}
+out:
+ kheap_free(KHEAP_TEMP, fsids, fsids_sz);
+}
- AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+void
+mount_dropcrossref(mount_t mp, vnode_t dp, int need_put)
+{
+ vnode_lock(dp);
+ mp->mnt_crossref--;
- if (vp->v_type != VDIR) {
- error = ENOTDIR;
- goto out;
+ if (mp->mnt_crossref < 0) {
+ panic("mount cross refs -ve");
}
+ if ((mp != dp->v_mountedhere) && (mp->mnt_crossref == 0)) {
+ if (need_put) {
+ vnode_put_locked(dp);
+ }
+ vnode_unlock(dp);
+
+ mount_lock_destroy(mp);
#if CONFIG_MACF
- error = mac_vnode_check_chdir(ctx, vp);
- if (error)
- goto out;
+ mac_mount_label_destroy(mp);
#endif
- error = vnode_authorize(vp, NULL, KAUTH_VNODE_SEARCH, ctx);
- if (error)
- goto out;
-
- while (!error && (mp = vp->v_mountedhere) != NULL) {
- if (vfs_busy(mp, LK_NOWAIT)) {
- error = EACCES;
- goto out;
- }
- error = VFS_ROOT(mp, &tdp, ctx);
- vfs_unbusy(mp);
- if (error)
- break;
- vnode_put(vp);
- vp = tdp;
+ zfree(mount_zone, mp);
+ return;
}
- if (error)
- goto out;
- if ( (error = vnode_ref(vp)) )
- goto out;
- vnode_put(vp);
-
- if (per_thread) {
- thread_t th = vfs_context_thread(ctx);
- if (th) {
- uthread_t uth = get_bsdthread_info(th);
- tvp = uth->uu_cdir;
- uth->uu_cdir = vp;
- OSBitOrAtomic(P_THCWD, (UInt32 *)&p->p_flag);
- } else {
- vnode_rele(vp);
- return (ENOENT);
- }
- } else {
- proc_fdlock(p);
- tvp = fdp->fd_cdir;
- fdp->fd_cdir = vp;
- proc_fdunlock(p);
+ if (need_put) {
+ vnode_put_locked(dp);
}
-
- if (tvp)
- vnode_rele(tvp);
- file_drop(uap->fd);
-
- return (0);
-out:
- vnode_put(vp);
- file_drop(uap->fd);
-
- return(error);
+ vnode_unlock(dp);
}
-int
-fchdir(proc_t p, struct fchdir_args *uap, __unused register_t *retval)
-{
- return common_fchdir(p, uap, 0);
-}
-int
-__pthread_fchdir(proc_t p, struct __pthread_fchdir_args *uap, __unused register_t *retval)
-{
- return common_fchdir(p, (void *)uap, 1);
-}
+/*
+ * Sync each mounted filesystem.
+ */
+#if DIAGNOSTIC
+int syncprt = 0;
+#endif
+
+int print_vmpage_stat = 0;
/*
- * Change current working directory (``.'').
+ * sync_callback: simple wrapper that calls VFS_SYNC() on volumes
+ * mounted read-write with the passed waitfor value.
*
- * Returns: 0 Success
- * change_dir:ENOTDIR
- * change_dir:???
- * vnode_ref:ENOENT No such file or directory
+ * Parameters: mp mount-point descriptor per mounted file-system instance.
+ * arg user argument (please see below)
+ *
+ * User argument is a pointer to 32 bit unsigned integer which describes the
+ * type of waitfor value to set for calling VFS_SYNC(). If user argument is
+ * passed as NULL, VFS_SYNC() is called with MNT_NOWAIT set as the default
+ * waitfor value.
+ *
+ * Returns: VFS_RETURNED
*/
-/* ARGSUSED */
static int
-common_chdir(proc_t p, struct chdir_args *uap, int per_thread)
+sync_callback(mount_t mp, void *arg)
{
- struct filedesc *fdp = p->p_fd;
- int error;
- struct nameidata nd;
- vnode_t tvp;
- vfs_context_t ctx = vfs_context_current();
+ if ((mp->mnt_flag & MNT_RDONLY) == 0) {
+ int asyncflag = mp->mnt_flag & MNT_ASYNC;
+ unsigned waitfor = MNT_NOWAIT;
- NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- error = change_dir(&nd, ctx);
- if (error)
- return (error);
- if ( (error = vnode_ref(nd.ni_vp)) ) {
- vnode_put(nd.ni_vp);
- return (error);
- }
- /*
- * drop the iocount we picked up in change_dir
- */
- vnode_put(nd.ni_vp);
+ if (arg) {
+ waitfor = *(uint32_t*)arg;
+ }
- if (per_thread) {
- thread_t th = vfs_context_thread(ctx);
- if (th) {
- uthread_t uth = get_bsdthread_info(th);
- tvp = uth->uu_cdir;
- uth->uu_cdir = nd.ni_vp;
- OSBitOrAtomic(P_THCWD, (UInt32 *)&p->p_flag);
- } else {
- vnode_rele(nd.ni_vp);
- return (ENOENT);
+ /* Sanity check for flags - these are the only valid combinations for the flag bits*/
+ if (waitfor != MNT_WAIT &&
+ waitfor != (MNT_WAIT | MNT_VOLUME) &&
+ waitfor != MNT_NOWAIT &&
+ waitfor != (MNT_NOWAIT | MNT_VOLUME) &&
+ waitfor != MNT_DWAIT &&
+ waitfor != (MNT_DWAIT | MNT_VOLUME)) {
+ panic("Passed inappropriate waitfor %u to "
+ "sync_callback()", waitfor);
}
- } else {
- proc_fdlock(p);
- tvp = fdp->fd_cdir;
- fdp->fd_cdir = nd.ni_vp;
- proc_fdunlock(p);
- }
- if (tvp)
- vnode_rele(tvp);
+ mp->mnt_flag &= ~MNT_ASYNC;
+ (void)VFS_SYNC(mp, waitfor, vfs_context_kernel());
+ if (asyncflag) {
+ mp->mnt_flag |= MNT_ASYNC;
+ }
+ }
- return (0);
+ return VFS_RETURNED;
}
+/* ARGSUSED */
int
-chdir(proc_t p, struct chdir_args *uap, __unused register_t *retval)
+sync(__unused proc_t p, __unused struct sync_args *uap, __unused int32_t *retval)
{
- return common_chdir(p, (void *)uap, 0);
+ vfs_iterate(LK_NOWAIT, sync_callback, NULL);
+
+ if (print_vmpage_stat) {
+ vm_countdirtypages();
+ }
+
+#if DIAGNOSTIC
+ if (syncprt) {
+ vfs_bufstats();
+ }
+#endif /* DIAGNOSTIC */
+ return 0;
}
-int
-__pthread_chdir(proc_t p, struct __pthread_chdir_args *uap, __unused register_t *retval)
+typedef enum {
+ SYNC_ALL = 0,
+ SYNC_ONLY_RELIABLE_MEDIA = 1,
+ SYNC_ONLY_UNRELIABLE_MEDIA = 2
+} sync_type_t;
+
+static int
+sync_internal_callback(mount_t mp, void *arg)
{
- return common_chdir(p, (void *)uap, 1);
+ if (arg) {
+ int is_reliable = !(mp->mnt_kern_flag & MNTK_VIRTUALDEV) &&
+ (mp->mnt_flag & MNT_LOCAL);
+ sync_type_t sync_type = *((sync_type_t *)arg);
+
+ if ((sync_type == SYNC_ONLY_RELIABLE_MEDIA) && !is_reliable) {
+ return VFS_RETURNED;
+ } else if ((sync_type == SYNC_ONLY_UNRELIABLE_MEDIA) && is_reliable) {
+ return VFS_RETURNED;
+ }
+ }
+
+ (void)sync_callback(mp, NULL);
+
+ return VFS_RETURNED;
}
+int sync_thread_state = 0;
+int sync_timeout_seconds = 5;
-/*
- * Change notion of root (``/'') directory.
- */
-/* ARGSUSED */
-int
-chroot(proc_t p, struct chroot_args *uap, __unused register_t *retval)
+#define SYNC_THREAD_RUN 0x0001
+#define SYNC_THREAD_RUNNING 0x0002
+
+#if CONFIG_PHYS_WRITE_ACCT
+thread_t pm_sync_thread;
+#endif /* CONFIG_PHYS_WRITE_ACCT */
+
+static void
+sync_thread(__unused void *arg, __unused wait_result_t wr)
{
- struct filedesc *fdp = p->p_fd;
- int error;
- struct nameidata nd;
- vnode_t tvp;
- vfs_context_t ctx = vfs_context_current();
+ sync_type_t sync_type;
+#if CONFIG_PHYS_WRITE_ACCT
+ pm_sync_thread = current_thread();
+#endif /* CONFIG_PHYS_WRITE_ACCT */
- if ((error = suser(kauth_cred_get(), &p->p_acflag)))
- return (error);
+ lck_mtx_lock(sync_mtx_lck);
+ while (sync_thread_state & SYNC_THREAD_RUN) {
+ sync_thread_state &= ~SYNC_THREAD_RUN;
+ lck_mtx_unlock(sync_mtx_lck);
- NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- error = change_dir(&nd, ctx);
- if (error)
- return (error);
+ sync_type = SYNC_ONLY_RELIABLE_MEDIA;
+ vfs_iterate(LK_NOWAIT, sync_internal_callback, &sync_type);
+ sync_type = SYNC_ONLY_UNRELIABLE_MEDIA;
+ vfs_iterate(LK_NOWAIT, sync_internal_callback, &sync_type);
-#if CONFIG_MACF
- error = mac_vnode_check_chroot(ctx, nd.ni_vp,
- &nd.ni_cnd);
- if (error) {
- vnode_put(nd.ni_vp);
- return (error);
+ lck_mtx_lock(sync_mtx_lck);
}
-#endif
-
- if ( (error = vnode_ref(nd.ni_vp)) ) {
- vnode_put(nd.ni_vp);
- return (error);
+ /*
+ * This wakeup _has_ to be issued before the lock is released otherwise
+ * we may end up waking up a thread in sync_internal which is
+ * expecting a wakeup from a thread it just created and not from this
+ * thread which is about to exit.
+ */
+ wakeup(&sync_thread_state);
+ sync_thread_state &= ~SYNC_THREAD_RUNNING;
+#if CONFIG_PHYS_WRITE_ACCT
+ pm_sync_thread = NULL;
+#endif /* CONFIG_PHYS_WRITE_ACCT */
+ lck_mtx_unlock(sync_mtx_lck);
+
+ if (print_vmpage_stat) {
+ vm_countdirtypages();
}
- vnode_put(nd.ni_vp);
-
- proc_fdlock(p);
- tvp = fdp->fd_rdir;
- fdp->fd_rdir = nd.ni_vp;
- fdp->fd_flags |= FD_CHROOT;
- proc_fdunlock(p);
- if (tvp != NULL)
- vnode_rele(tvp);
-
- return (0);
+#if DIAGNOSTIC
+ if (syncprt) {
+ vfs_bufstats();
+ }
+#endif /* DIAGNOSTIC */
}
+struct timeval sync_timeout_last_print = {.tv_sec = 0, .tv_usec = 0};
+
/*
- * Common routine for chroot and chdir.
- *
- * Returns: 0 Success
- * ENOTDIR Not a directory
- * namei:??? [anything namei can return]
- * vnode_authorize:??? [anything vnode_authorize can return]
+ * An in-kernel sync for power management to call.
+ * This function always returns within sync_timeout seconds.
*/
-static int
-change_dir(struct nameidata *ndp, vfs_context_t ctx)
+__private_extern__ int
+sync_internal(void)
{
- vnode_t vp;
+ thread_t thd;
int error;
-
- if ((error = namei(ndp)))
- return (error);
- nameidone(ndp);
- vp = ndp->ni_vp;
-
- if (vp->v_type != VDIR) {
- vnode_put(vp);
- return (ENOTDIR);
+ int thread_created = FALSE;
+ struct timespec ts = {.tv_sec = sync_timeout_seconds, .tv_nsec = 0};
+
+ lck_mtx_lock(sync_mtx_lck);
+ sync_thread_state |= SYNC_THREAD_RUN;
+ if (!(sync_thread_state & SYNC_THREAD_RUNNING)) {
+ int kr;
+
+ sync_thread_state |= SYNC_THREAD_RUNNING;
+ kr = kernel_thread_start(sync_thread, NULL, &thd);
+ if (kr != KERN_SUCCESS) {
+ sync_thread_state &= ~SYNC_THREAD_RUNNING;
+ lck_mtx_unlock(sync_mtx_lck);
+ printf("sync_thread failed\n");
+ return 0;
+ }
+ thread_created = TRUE;
}
-#if CONFIG_MACF
- error = mac_vnode_check_chdir(ctx, vp);
+ error = msleep((caddr_t)&sync_thread_state, sync_mtx_lck,
+ (PVFS | PDROP | PCATCH), "sync_thread", &ts);
if (error) {
- vnode_put(vp);
- return (error);
+ struct timeval now;
+
+ microtime(&now);
+ if (now.tv_sec - sync_timeout_last_print.tv_sec > 120) {
+ printf("sync timed out: %d sec\n", sync_timeout_seconds);
+ sync_timeout_last_print.tv_sec = now.tv_sec;
+ }
}
-#endif
- error = vnode_authorize(vp, NULL, KAUTH_VNODE_SEARCH, ctx);
- if (error) {
- vnode_put(vp);
- return (error);
+ if (thread_created) {
+ thread_deallocate(thd);
}
- return (error);
-}
+ return 0;
+} /* end of sync_internal call */
/*
- * Check permissions, allocate an open file structure,
- * and call the device open routine if any.
- *
- * Returns: 0 Success
- * EINVAL
- * EINTR
- * falloc:ENFILE
- * falloc:EMFILE
- * falloc:ENOMEM
- * vn_open_auth:???
- * dupfdopen:???
- * VNOP_ADVLOCK:???
- * vnode_setsize:???
+ * Change filesystem quotas.
*/
-#warning XXX implement uid, gid
+#if QUOTA
int
-open1(vfs_context_t ctx, struct nameidata *ndp, int uflags, struct vnode_attr *vap, register_t *retval)
+quotactl(proc_t p, struct quotactl_args *uap, __unused int32_t *retval)
{
- proc_t p = vfs_context_proc(ctx);
- uthread_t uu = get_bsdthread_info(vfs_context_thread(ctx));
- struct filedesc *fdp = p->p_fd;
- struct fileproc *fp;
- vnode_t vp;
- int flags, oflags;
- struct fileproc *nfp;
- int type, indx, error;
- struct flock lf;
- int no_controlling_tty = 0;
- int deny_controlling_tty = 0;
- struct session *sessp = SESSION_NULL;
- struct vfs_context context = *vfs_context_current(); /* local copy */
-
- oflags = uflags;
-
- if ((oflags & O_ACCMODE) == O_ACCMODE)
- return(EINVAL);
- flags = FFLAGS(uflags);
-
- AUDIT_ARG(fflags, oflags);
- AUDIT_ARG(mode, vap->va_mode);
+ struct mount *mp;
+ int error, quota_cmd, quota_status = 0;
+ caddr_t datap;
+ size_t fnamelen;
+ struct nameidata nd;
+ vfs_context_t ctx = vfs_context_current();
+ struct dqblk my_dqblk = {};
- if ( (error = falloc(p, &nfp, &indx, ctx)) ) {
- return (error);
+ AUDIT_ARG(uid, uap->uid);
+ AUDIT_ARG(cmd, uap->cmd);
+ NDINIT(&nd, LOOKUP, OP_LOOKUP, FOLLOW | AUDITVNPATH1, UIO_USERSPACE,
+ uap->path, ctx);
+ error = namei(&nd);
+ if (error) {
+ return error;
}
- fp = nfp;
- uu->uu_dupfd = -indx - 1;
+ mp = nd.ni_vp->v_mount;
+ mount_ref(mp, 0);
+ vnode_put(nd.ni_vp);
+ nameidone(&nd);
- if (!(p->p_flag & P_CONTROLT)) {
- sessp = proc_session(p);
- no_controlling_tty = 1;
- /*
- * If conditions would warrant getting a controlling tty if
- * the device being opened is a tty (see ttyopen in tty.c),
- * but the open flags deny it, set a flag in the session to
- * prevent it.
- */
- if (SESS_LEADER(p, sessp) &&
- sessp->s_ttyvp == NULL &&
- (flags & O_NOCTTY)) {
- session_lock(sessp);
- sessp->s_flags |= S_NOCTTY;
- session_unlock(sessp);
- deny_controlling_tty = 1;
- }
- }
+ /* copyin any data we will need for downstream code */
+ quota_cmd = uap->cmd >> SUBCMDSHIFT;
- if ((error = vn_open_auth(ndp, &flags, vap))) {
- if ((error == ENODEV || error == ENXIO) && (uu->uu_dupfd >= 0)){ /* XXX from fdopen */
- if ((error = dupfdopen(fdp, indx, uu->uu_dupfd, flags, error)) == 0) {
- fp_drop(p, indx, NULL, 0);
- *retval = indx;
- if (deny_controlling_tty) {
- session_lock(sessp);
- sessp->s_flags &= ~S_NOCTTY;
- session_unlock(sessp);
- }
- if (sessp != SESSION_NULL)
- session_rele(sessp);
- return (0);
+ switch (quota_cmd) {
+ case Q_QUOTAON:
+ /* uap->arg specifies a file from which to take the quotas */
+ fnamelen = MAXPATHLEN;
+ datap = zalloc(ZV_NAMEI);
+ error = copyinstr(uap->arg, datap, MAXPATHLEN, &fnamelen);
+ break;
+ case Q_GETQUOTA:
+ /* uap->arg is a pointer to a dqblk structure. */
+ datap = (caddr_t) &my_dqblk;
+ break;
+ case Q_SETQUOTA:
+ case Q_SETUSE:
+ /* uap->arg is a pointer to a dqblk structure. */
+ datap = (caddr_t) &my_dqblk;
+ if (proc_is64bit(p)) {
+ struct user_dqblk my_dqblk64;
+ error = copyin(uap->arg, (caddr_t)&my_dqblk64, sizeof(my_dqblk64));
+ if (error == 0) {
+ munge_dqblk(&my_dqblk, &my_dqblk64, FALSE);
}
+ } else {
+ error = copyin(uap->arg, (caddr_t)&my_dqblk, sizeof(my_dqblk));
}
- if (error == ERESTART)
- error = EINTR;
- fp_free(p, indx, fp);
+ break;
+ case Q_QUOTASTAT:
+ /* uap->arg is a pointer to an integer */
+ datap = (caddr_t) "a_status;
+ break;
+ default:
+ datap = NULL;
+ break;
+ } /* switch */
- if (deny_controlling_tty) {
- session_lock(sessp);
- sessp->s_flags &= ~S_NOCTTY;
- session_unlock(sessp);
- }
- if (sessp != SESSION_NULL)
- session_rele(sessp);
- return (error);
+ if (error == 0) {
+ error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, datap, ctx);
}
- uu->uu_dupfd = 0;
- vp = ndp->ni_vp;
- fp->f_fglob->fg_flag = flags & (FMASK | O_EVTONLY);
- fp->f_fglob->fg_type = DTYPE_VNODE;
- fp->f_fglob->fg_ops = &vnops;
- fp->f_fglob->fg_data = (caddr_t)vp;
+ switch (quota_cmd) {
+ case Q_QUOTAON:
+ if (datap != NULL) {
+ zfree(ZV_NAMEI, datap);
+ }
+ break;
+ case Q_GETQUOTA:
+ /* uap->arg is a pointer to a dqblk structure we need to copy out to */
+ if (error == 0) {
+ if (proc_is64bit(p)) {
+ struct user_dqblk my_dqblk64;
- if (flags & (O_EXLOCK | O_SHLOCK)) {
- lf.l_whence = SEEK_SET;
- lf.l_start = 0;
- lf.l_len = 0;
- if (flags & O_EXLOCK)
- lf.l_type = F_WRLCK;
- else
- lf.l_type = F_RDLCK;
- type = F_FLOCK;
- if ((flags & FNONBLOCK) == 0)
- type |= F_WAIT;
-#if CONFIG_MACF
- error = mac_file_check_lock(vfs_context_ucred(ctx), fp->f_fglob,
- F_SETLK, &lf);
- if (error)
- goto bad;
-#endif
- if ((error = VNOP_ADVLOCK(vp, (caddr_t)fp->f_fglob, F_SETLK, &lf, type, ctx)))
- goto bad;
- fp->f_fglob->fg_flag |= FHASLOCK;
- }
+ memset(&my_dqblk64, 0, sizeof(my_dqblk64));
+ munge_dqblk(&my_dqblk, &my_dqblk64, TRUE);
+ error = copyout((caddr_t)&my_dqblk64, uap->arg, sizeof(my_dqblk64));
+ } else {
+ error = copyout(datap, uap->arg, sizeof(struct dqblk));
+ }
+ }
+ break;
+ case Q_QUOTASTAT:
+ /* uap->arg is a pointer to an integer */
+ if (error == 0) {
+ error = copyout(datap, uap->arg, sizeof(quota_status));
+ }
+ break;
+ default:
+ break;
+ } /* switch */
- /* try to truncate by setting the size attribute */
- if ((flags & O_TRUNC) && ((error = vnode_setsize(vp, (off_t)0, 0, ctx)) != 0))
- goto bad;
+ mount_drop(mp, 0);
+ return error;
+}
+#else
+int
+quotactl(__unused proc_t p, __unused struct quotactl_args *uap, __unused int32_t *retval)
+{
+ return EOPNOTSUPP;
+}
+#endif /* QUOTA */
- /*
- * If the open flags denied the acquisition of a controlling tty,
- * clear the flag in the session structure that prevented the lower
- * level code from assigning one.
- */
- if (deny_controlling_tty) {
- session_lock(sessp);
- sessp->s_flags &= ~S_NOCTTY;
- session_unlock(sessp);
- }
+/*
+ * Get filesystem statistics.
+ *
+ * Returns: 0 Success
+ * namei:???
+ * vfs_update_vfsstat:???
+ * munge_statfs:EFAULT
+ */
+/* ARGSUSED */
+int
+statfs(__unused proc_t p, struct statfs_args *uap, __unused int32_t *retval)
+{
+ struct mount *mp;
+ struct vfsstatfs *sp;
+ int error;
+ struct nameidata nd;
+ vfs_context_t ctx = vfs_context_current();
+ vnode_t vp;
- /*
- * If a controlling tty was set by the tty line discipline, then we
- * want to set the vp of the tty into the session structure. We have
- * a race here because we can't get to the vp for the tp in ttyopen,
- * because it's not passed as a parameter in the open path.
- */
- if (no_controlling_tty && (p->p_flag & P_CONTROLT)) {
- vnode_t ttyvp;
- vnode_ref(vp);
- session_lock(sessp);
- ttyvp = sessp->s_ttyvp;
- sessp->s_ttyvp = vp;
- sessp->s_ttyvid = vnode_vid(vp);
- session_unlock(sessp);
- if (ttyvp != NULLVP)
- vnode_rele(ttyvp);
+ NDINIT(&nd, LOOKUP, OP_STATFS, FOLLOW | AUDITVNPATH1,
+ UIO_USERSPACE, uap->path, ctx);
+ error = namei(&nd);
+ if (error != 0) {
+ return error;
}
+ vp = nd.ni_vp;
+ mp = vp->v_mount;
+ sp = &mp->mnt_vfsstat;
+ nameidone(&nd);
- vnode_put(vp);
-
- proc_fdlock(p);
- procfdtbl_releasefd(p, indx, NULL);
- fp_drop(p, indx, fp, 1);
- proc_fdunlock(p);
-
- *retval = indx;
-
- if (sessp != SESSION_NULL)
- session_rele(sessp);
- return (0);
-bad:
- if (deny_controlling_tty) {
- session_lock(sessp);
- sessp->s_flags &= ~S_NOCTTY;
- session_unlock(sessp);
+#if CONFIG_MACF
+ error = mac_mount_check_stat(ctx, mp);
+ if (error != 0) {
+ vnode_put(vp);
+ return error;
}
- if (sessp != SESSION_NULL)
- session_rele(sessp);
+#endif
- /* Modify local copy (to not damage thread copy) */
- context.vc_ucred = fp->f_fglob->fg_cred;
+ error = vfs_update_vfsstat(mp, ctx, VFS_USER_EVENT);
+ if (error != 0) {
+ vnode_put(vp);
+ return error;
+ }
- vn_close(vp, fp->f_fglob->fg_flag, &context);
+ error = munge_statfs(mp, sp, uap->buf, NULL, IS_64BIT_PROCESS(p), TRUE);
vnode_put(vp);
- fp_free(p, indx, fp);
-
- return (error);
-
+ return error;
}
/*
- * An open system call using an extended argument list compared to the regular
- * system call 'open'.
- *
- * Parameters: p Process requesting the open
- * uap User argument descriptor (see below)
- * retval Pointer to an area to receive the
- * return calue from the system call
- *
- * Indirect: uap->path Path to open (same as 'open')
- * uap->flags Flags to open (same as 'open'
- * uap->uid UID to set, if creating
- * uap->gid GID to set, if creating
- * uap->mode File mode, if creating (same as 'open')
- * uap->xsecurity ACL to set, if creating
- *
- * Returns: 0 Success
- * !0 errno value
- *
- * Notes: The kauth_filesec_t in 'va', if any, is in host byte order.
- *
- * XXX: We should enummerate the possible errno values here, and where
- * in the code they originated.
+ * Get filesystem statistics.
*/
+/* ARGSUSED */
int
-open_extended(proc_t p, struct open_extended_args *uap, register_t *retval)
+fstatfs(__unused proc_t p, struct fstatfs_args *uap, __unused int32_t *retval)
{
- struct filedesc *fdp = p->p_fd;
- int ciferror;
- kauth_filesec_t xsecdst;
- struct vnode_attr va;
- struct nameidata nd;
- int cmode;
-
- xsecdst = NULL;
- if ((uap->xsecurity != USER_ADDR_NULL) &&
- ((ciferror = kauth_copyinfilesec(uap->xsecurity, &xsecdst)) != 0))
- return ciferror;
+ vnode_t vp;
+ struct mount *mp;
+ struct vfsstatfs *sp;
+ int error;
- VATTR_INIT(&va);
- cmode = ((uap->mode &~ fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT;
- VATTR_SET(&va, va_mode, cmode);
- if (uap->uid != KAUTH_UID_NONE)
- VATTR_SET(&va, va_uid, uap->uid);
- if (uap->gid != KAUTH_GID_NONE)
- VATTR_SET(&va, va_gid, uap->gid);
- if (xsecdst != NULL)
- VATTR_SET(&va, va_acl, &xsecdst->fsec_acl);
+ AUDIT_ARG(fd, uap->fd);
- NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNPATH1, UIO_USERSPACE, uap->path, vfs_context_current());
+ if ((error = file_vnode(uap->fd, &vp))) {
+ return error;
+ }
- ciferror = open1(vfs_context_current(), &nd, uap->flags, &va, retval);
- if (xsecdst != NULL)
- kauth_filesec_free(xsecdst);
+ error = vnode_getwithref(vp);
+ if (error) {
+ file_drop(uap->fd);
+ return error;
+ }
- return ciferror;
-}
+ AUDIT_ARG(vnpath_withref, vp, ARG_VNODE1);
-int
-open(proc_t p, struct open_args *uap, register_t *retval)
-{
- __pthread_testcancel(1);
- return(open_nocancel(p, (struct open_nocancel_args *)uap, retval));
-}
+ mp = vp->v_mount;
+ if (!mp) {
+ error = EBADF;
+ goto out;
+ }
+#if CONFIG_MACF
+ error = mac_mount_check_stat(vfs_context_current(), mp);
+ if (error != 0) {
+ goto out;
+ }
+#endif
-int
-open_nocancel(proc_t p, struct open_nocancel_args *uap, register_t *retval)
-{
- struct filedesc *fdp = p->p_fd;
- struct vnode_attr va;
- struct nameidata nd;
- int cmode;
+ sp = &mp->mnt_vfsstat;
+ if ((error = vfs_update_vfsstat(mp, vfs_context_current(), VFS_USER_EVENT)) != 0) {
+ goto out;
+ }
- VATTR_INIT(&va);
- /* Mask off all but regular access permissions */
- cmode = ((uap->mode &~ fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT;
- VATTR_SET(&va, va_mode, cmode & ACCESSPERMS);
+ error = munge_statfs(mp, sp, uap->buf, NULL, IS_64BIT_PROCESS(p), TRUE);
- NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNPATH1, UIO_USERSPACE, uap->path, vfs_context_current());
+out:
+ file_drop(uap->fd);
+ vnode_put(vp);
- return(open1(vfs_context_current(), &nd, uap->flags, &va, retval));
+ return error;
}
+void
+vfs_get_statfs64(struct mount *mp, struct statfs64 *sfs)
+{
+ struct vfsstatfs *vsfs = &mp->mnt_vfsstat;
+
+ bzero(sfs, sizeof(*sfs));
+
+ sfs->f_bsize = vsfs->f_bsize;
+ sfs->f_iosize = (int32_t)vsfs->f_iosize;
+ sfs->f_blocks = vsfs->f_blocks;
+ sfs->f_bfree = vsfs->f_bfree;
+ sfs->f_bavail = vsfs->f_bavail;
+ sfs->f_files = vsfs->f_files;
+ sfs->f_ffree = vsfs->f_ffree;
+ sfs->f_fsid = vsfs->f_fsid;
+ sfs->f_owner = vsfs->f_owner;
+ sfs->f_type = mp->mnt_vtable->vfc_typenum;
+ sfs->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+ sfs->f_fssubtype = vsfs->f_fssubtype;
+ sfs->f_flags_ext = (mp->mnt_kern_flag & MNTK_SYSTEMDATA) ? MNT_EXT_ROOT_DATA_VOL : 0;
+ if (mp->mnt_kern_flag & MNTK_TYPENAME_OVERRIDE) {
+ strlcpy(&sfs->f_fstypename[0], &mp->fstypename_override[0], MFSTYPENAMELEN);
+ } else {
+ strlcpy(&sfs->f_fstypename[0], &vsfs->f_fstypename[0], MFSTYPENAMELEN);
+ }
+ strlcpy(&sfs->f_mntonname[0], &vsfs->f_mntonname[0], MAXPATHLEN);
+ strlcpy(&sfs->f_mntfromname[0], &vsfs->f_mntfromname[0], MAXPATHLEN);
+}
/*
- * Create a special file.
+ * Get file system statistics in 64-bit mode
*/
-static int mkfifo1(vfs_context_t ctx, user_addr_t upath, struct vnode_attr *vap);
-
int
-mknod(proc_t p, struct mknod_args *uap, __unused register_t *retval)
+statfs64(__unused struct proc *p, struct statfs64_args *uap, __unused int32_t *retval)
{
- struct vnode_attr va;
- vfs_context_t ctx = vfs_context_current();
+ struct mount *mp;
int error;
- int whiteout = 0;
- struct nameidata nd;
- vnode_t vp, dvp;
-
- VATTR_INIT(&va);
- VATTR_SET(&va, va_mode, (uap->mode & ALLPERMS) & ~p->p_fd->fd_cmask);
- VATTR_SET(&va, va_rdev, uap->dev);
-
- /* If it's a mknod() of a FIFO, call mkfifo1() instead */
- if ((uap->mode & S_IFMT) == S_IFIFO)
- return(mkfifo1(ctx, uap->path, &va));
-
- AUDIT_ARG(mode, uap->mode);
- AUDIT_ARG(dev, uap->dev);
+ struct nameidata *ndp;
+ struct statfs64 *sfsp;
+ vfs_context_t ctxp = vfs_context_current();
+ vnode_t vp;
+ union {
+ struct nameidata nd;
+ struct statfs64 sfs;
+ } *__nameidata_statfs64;
- if ((error = suser(vfs_context_ucred(ctx), &p->p_acflag)))
- return (error);
- NDINIT(&nd, CREATE, LOCKPARENT | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- error = namei(&nd);
- if (error)
- return (error);
- dvp = nd.ni_dvp;
- vp = nd.ni_vp;
+ __nameidata_statfs64 = kheap_alloc(KHEAP_TEMP, sizeof(*__nameidata_statfs64),
+ Z_WAITOK);
+ ndp = &__nameidata_statfs64->nd;
- if (vp != NULL) {
- error = EEXIST;
+ NDINIT(ndp, LOOKUP, OP_STATFS, FOLLOW | AUDITVNPATH1,
+ UIO_USERSPACE, uap->path, ctxp);
+ error = namei(ndp);
+ if (error != 0) {
goto out;
}
+ vp = ndp->ni_vp;
+ mp = vp->v_mount;
+ nameidone(ndp);
- switch (uap->mode & S_IFMT) {
- case S_IFMT: /* used by badsect to flag bad sectors */
- VATTR_SET(&va, va_type, VBAD);
- break;
- case S_IFCHR:
- VATTR_SET(&va, va_type, VCHR);
- break;
- case S_IFBLK:
- VATTR_SET(&va, va_type, VBLK);
- break;
- case S_IFWHT:
- whiteout = 1;
- break;
- default:
- error = EINVAL;
+#if CONFIG_MACF
+ error = mac_mount_check_stat(ctxp, mp);
+ if (error != 0) {
+ vnode_put(vp);
goto out;
}
+#endif
-#if CONFIG_MACF
- if (!whiteout) {
- error = mac_vnode_check_create(ctx,
- nd.ni_dvp, &nd.ni_cnd, &va);
- if (error)
- goto out;
- }
-#endif
-
- if ((error = vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_FILE, ctx)) != 0)
- goto out;
-
- if (whiteout) {
- error = VNOP_WHITEOUT(dvp, &nd.ni_cnd, CREATE, ctx);
- } else {
- error = vn_create(dvp, &vp, &nd.ni_cnd, &va, 0, ctx);
- }
- if (error)
+ error = vfs_update_vfsstat(mp, ctxp, VFS_USER_EVENT);
+ if (error != 0) {
+ vnode_put(vp);
goto out;
+ }
- if (vp) {
- int update_flags = 0;
-
- // Make sure the name & parent pointers are hooked up
- if (vp->v_name == NULL)
- update_flags |= VNODE_UPDATE_NAME;
- if (vp->v_parent == NULLVP)
- update_flags |= VNODE_UPDATE_PARENT;
-
- if (update_flags)
- vnode_update_identity(vp, dvp, nd.ni_cnd.cn_nameptr, nd.ni_cnd.cn_namelen, nd.ni_cnd.cn_hash, update_flags);
-
-#if CONFIG_FSE
- add_fsevent(FSE_CREATE_FILE, ctx,
- FSE_ARG_VNODE, vp,
- FSE_ARG_DONE);
-#endif
+ sfsp = &__nameidata_statfs64->sfs;
+ vfs_get_statfs64(mp, sfsp);
+ if ((mp->mnt_kern_flag & MNTK_SYSTEMDATA) &&
+ (p->p_vfs_iopolicy & P_VFS_IOPOLICY_STATFS_NO_DATA_VOLUME)) {
+ /* This process does not want to see a seperate data volume mountpoint */
+ strlcpy(&sfsp->f_mntonname[0], "/", sizeof("/"));
}
+ error = copyout(sfsp, uap->buf, sizeof(*sfsp));
+ vnode_put(vp);
out:
- /*
- * nameidone has to happen before we vnode_put(dvp)
- * since it may need to release the fs_nodelock on the dvp
- */
- nameidone(&nd);
+ kheap_free(KHEAP_TEMP, __nameidata_statfs64, sizeof(*__nameidata_statfs64));
- if (vp)
- vnode_put(vp);
- vnode_put(dvp);
-
- return (error);
+ return error;
}
/*
- * Create a named pipe.
- *
- * Returns: 0 Success
- * EEXIST
- * namei:???
- * vnode_authorize:???
- * vn_create:???
+ * Get file system statistics in 64-bit mode
*/
-static int
-mkfifo1(vfs_context_t ctx, user_addr_t upath, struct vnode_attr *vap)
+int
+fstatfs64(__unused struct proc *p, struct fstatfs64_args *uap, __unused int32_t *retval)
{
- vnode_t vp, dvp;
+ struct vnode *vp;
+ struct mount *mp;
+ struct statfs64 sfs;
int error;
- struct nameidata nd;
- NDINIT(&nd, CREATE, LOCKPARENT | AUDITVNPATH1,
- UIO_USERSPACE, upath, ctx);
- error = namei(&nd);
- if (error)
- return (error);
- dvp = nd.ni_dvp;
- vp = nd.ni_vp;
+ AUDIT_ARG(fd, uap->fd);
+
+ if ((error = file_vnode(uap->fd, &vp))) {
+ return error;
+ }
+
+ error = vnode_getwithref(vp);
+ if (error) {
+ file_drop(uap->fd);
+ return error;
+ }
+
+ AUDIT_ARG(vnpath_withref, vp, ARG_VNODE1);
- /* check that this is a new file and authorize addition */
- if (vp != NULL) {
- error = EEXIST;
- goto out;
- }
- VATTR_SET(vap, va_type, VFIFO);
+ mp = vp->v_mount;
+ if (!mp) {
+ error = EBADF;
+ goto out;
+ }
#if CONFIG_MACF
- error = mac_vnode_check_create(ctx, nd.ni_dvp,
- &nd.ni_cnd, vap);
- if (error)
+ error = mac_mount_check_stat(vfs_context_current(), mp);
+ if (error != 0) {
goto out;
+ }
#endif
+ if ((error = vfs_update_vfsstat(mp, vfs_context_current(), VFS_USER_EVENT)) != 0) {
+ goto out;
+ }
- if ((error = vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_FILE, ctx)) != 0)
- goto out;
+ vfs_get_statfs64(mp, &sfs);
+ if ((mp->mnt_kern_flag & MNTK_SYSTEMDATA) &&
+ (p->p_vfs_iopolicy & P_VFS_IOPOLICY_STATFS_NO_DATA_VOLUME)) {
+ /* This process does not want to see a seperate data volume mountpoint */
+ strlcpy(&sfs.f_mntonname[0], "/", sizeof("/"));
+ }
+ error = copyout(&sfs, uap->buf, sizeof(sfs));
-
- error = vn_create(dvp, &vp, &nd.ni_cnd, vap, 0, ctx);
out:
- /*
- * nameidone has to happen before we vnode_put(dvp)
- * since it may need to release the fs_nodelock on the dvp
- */
- nameidone(&nd);
-
- if (vp)
- vnode_put(vp);
- vnode_put(dvp);
+ file_drop(uap->fd);
+ vnode_put(vp);
return error;
}
+struct getfsstat_struct {
+ user_addr_t sfsp;
+ user_addr_t *mp;
+ int count;
+ int maxcount;
+ int flags;
+ int error;
+};
-/*
- * A mkfifo system call using an extended argument list compared to the regular
- * system call 'mkfifo'.
- *
- * Parameters: p Process requesting the open
- * uap User argument descriptor (see below)
- * retval (Ignored)
- *
- * Indirect: uap->path Path to fifo (same as 'mkfifo')
- * uap->uid UID to set
- * uap->gid GID to set
- * uap->mode File mode to set (same as 'mkfifo')
- * uap->xsecurity ACL to set, if creating
- *
- * Returns: 0 Success
- * !0 errno value
- *
- * Notes: The kauth_filesec_t in 'va', if any, is in host byte order.
- *
- * XXX: We should enummerate the possible errno values here, and where
- * in the code they originated.
- */
-int
-mkfifo_extended(proc_t p, struct mkfifo_extended_args *uap, __unused register_t *retval)
-{
- int ciferror;
- kauth_filesec_t xsecdst;
- struct vnode_attr va;
- xsecdst = KAUTH_FILESEC_NONE;
- if (uap->xsecurity != USER_ADDR_NULL) {
- if ((ciferror = kauth_copyinfilesec(uap->xsecurity, &xsecdst)) != 0)
- return ciferror;
- }
+static int
+getfsstat_callback(mount_t mp, void * arg)
+{
+ struct getfsstat_struct *fstp = (struct getfsstat_struct *)arg;
+ struct vfsstatfs *sp;
+ int error, my_size;
+ vfs_context_t ctx = vfs_context_current();
- VATTR_INIT(&va);
- VATTR_SET(&va, va_mode, (uap->mode & ALLPERMS) & ~p->p_fd->fd_cmask);
- if (uap->uid != KAUTH_UID_NONE)
- VATTR_SET(&va, va_uid, uap->uid);
- if (uap->gid != KAUTH_GID_NONE)
- VATTR_SET(&va, va_gid, uap->gid);
- if (xsecdst != KAUTH_FILESEC_NONE)
- VATTR_SET(&va, va_acl, &xsecdst->fsec_acl);
+ if (fstp->sfsp && fstp->count < fstp->maxcount) {
+#if CONFIG_MACF
+ error = mac_mount_check_stat(ctx, mp);
+ if (error != 0) {
+ fstp->error = error;
+ return VFS_RETURNED_DONE;
+ }
+#endif
+ sp = &mp->mnt_vfsstat;
+ /*
+ * If MNT_NOWAIT is specified, do not refresh the
+ * fsstat cache. MNT_WAIT/MNT_DWAIT overrides MNT_NOWAIT.
+ */
+ if ((mp->mnt_lflag & MNT_LDEAD) ||
+ (((fstp->flags & MNT_NOWAIT) == 0 || (fstp->flags & (MNT_WAIT | MNT_DWAIT))) &&
+ (!(mp->mnt_lflag & MNT_LUNMOUNT)) &&
+ (error = vfs_update_vfsstat(mp, ctx, VFS_USER_EVENT)))) {
+ KAUTH_DEBUG("vfs_update_vfsstat returned %d", error);
+ return VFS_RETURNED;
+ }
- ciferror = mkfifo1(vfs_context_current(), uap->path, &va);
+ /*
+ * Need to handle LP64 version of struct statfs
+ */
+ error = munge_statfs(mp, sp, fstp->sfsp, &my_size, IS_64BIT_PROCESS(vfs_context_proc(ctx)), FALSE);
+ if (error) {
+ fstp->error = error;
+ return VFS_RETURNED_DONE;
+ }
+ fstp->sfsp += my_size;
- if (xsecdst != KAUTH_FILESEC_NONE)
- kauth_filesec_free(xsecdst);
- return ciferror;
+ if (fstp->mp) {
+#if CONFIG_MACF
+ error = mac_mount_label_get(mp, *fstp->mp);
+ if (error) {
+ fstp->error = error;
+ return VFS_RETURNED_DONE;
+ }
+#endif
+ fstp->mp++;
+ }
+ }
+ fstp->count++;
+ return VFS_RETURNED;
}
-/* ARGSUSED */
+/*
+ * Get statistics on all filesystems.
+ */
int
-mkfifo(proc_t p, struct mkfifo_args *uap, __unused register_t *retval)
+getfsstat(__unused proc_t p, struct getfsstat_args *uap, int *retval)
{
- struct vnode_attr va;
+ struct __mac_getfsstat_args muap;
- VATTR_INIT(&va);
- VATTR_SET(&va, va_mode, (uap->mode & ALLPERMS) & ~p->p_fd->fd_cmask);
+ muap.buf = uap->buf;
+ muap.bufsize = uap->bufsize;
+ muap.mac = USER_ADDR_NULL;
+ muap.macsize = 0;
+ muap.flags = uap->flags;
- return(mkfifo1(vfs_context_current(), uap->path, &va));
+ return __mac_getfsstat(p, &muap, retval);
}
/*
- * Make a hard file link.
+ * __mac_getfsstat: Get MAC-related file system statistics
+ *
+ * Parameters: p (ignored)
+ * uap User argument descriptor (see below)
+ * retval Count of file system statistics (N stats)
+ *
+ * Indirect: uap->bufsize Buffer size
+ * uap->macsize MAC info size
+ * uap->buf Buffer where information will be returned
+ * uap->mac MAC info
+ * uap->flags File system flags
+ *
+ *
+ * Returns: 0 Success
+ * !0 Not success
*
- * Returns: 0 Success
- * EPERM
- * EEXIST
- * EXDEV
- * namei:???
- * vnode_authorize:???
- * VNOP_LINK:???
*/
-/* ARGSUSED */
int
-link(__unused proc_t p, struct link_args *uap, __unused register_t *retval)
+__mac_getfsstat(__unused proc_t p, struct __mac_getfsstat_args *uap, int *retval)
{
- vnode_t vp, dvp, lvp;
- struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
- int error;
- fse_info finfo;
- int need_event, has_listeners;
- char *target_path = NULL;
+ user_addr_t sfsp;
+ user_addr_t *mp;
+ size_t count, maxcount, bufsize, macsize;
+ struct getfsstat_struct fst;
- vp = dvp = lvp = NULLVP;
+ if ((unsigned)uap->bufsize > INT_MAX || (unsigned)uap->macsize > INT_MAX) {
+ return EINVAL;
+ }
- /* look up the object we are linking to */
- NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- error = namei(&nd);
- if (error)
- return (error);
- vp = nd.ni_vp;
+ bufsize = (size_t) uap->bufsize;
+ macsize = (size_t) uap->macsize;
- nameidone(&nd);
+ if (IS_64BIT_PROCESS(p)) {
+ maxcount = bufsize / sizeof(struct user64_statfs);
+ } else {
+ maxcount = bufsize / sizeof(struct user32_statfs);
+ }
+ sfsp = uap->buf;
+ count = 0;
- /*
- * Normally, linking to directories is not supported.
- * However, some file systems may have limited support.
- */
- if (vp->v_type == VDIR) {
- if (!(vp->v_mount->mnt_vtable->vfc_vfsflags & VFC_VFSDIRLINKS)) {
- error = EPERM; /* POSIX */
- goto out;
+ mp = NULL;
+
+#if CONFIG_MACF
+ if (uap->mac != USER_ADDR_NULL) {
+ u_int32_t *mp0;
+ int error;
+ unsigned int i;
+
+ count = (macsize / (IS_64BIT_PROCESS(p) ? 8 : 4));
+ if (count != maxcount) {
+ return EINVAL;
}
- /* Linking to a directory requires ownership. */
- if (!kauth_cred_issuser(vfs_context_ucred(ctx))) {
- struct vnode_attr dva;
- VATTR_INIT(&dva);
- VATTR_WANTED(&dva, va_uid);
- if (vnode_getattr(vp, &dva, ctx) != 0 ||
- !VATTR_IS_SUPPORTED(&dva, va_uid) ||
- (dva.va_uid != kauth_cred_getuid(vfs_context_ucred(ctx)))) {
- error = EACCES;
- goto out;
+ /* Copy in the array */
+ mp0 = kheap_alloc(KHEAP_TEMP, macsize, Z_WAITOK);
+ if (mp0 == NULL) {
+ return ENOMEM;
+ }
+
+ error = copyin(uap->mac, mp0, macsize);
+ if (error) {
+ kheap_free(KHEAP_TEMP, mp0, macsize);
+ return error;
+ }
+
+ /* Normalize to an array of user_addr_t */
+ mp = kheap_alloc(KHEAP_TEMP, count * sizeof(user_addr_t), Z_WAITOK);
+ if (mp == NULL) {
+ kheap_free(KHEAP_TEMP, mp0, macsize);
+ return ENOMEM;
+ }
+
+ for (i = 0; i < count; i++) {
+ if (IS_64BIT_PROCESS(p)) {
+ mp[i] = ((user_addr_t *)mp0)[i];
+ } else {
+ mp[i] = (user_addr_t)mp0[i];
}
}
+ kheap_free(KHEAP_TEMP, mp0, macsize);
}
+#endif
- /* lookup the target node */
- nd.ni_cnd.cn_nameiop = CREATE;
- nd.ni_cnd.cn_flags = LOCKPARENT | AUDITVNPATH2 | CN_NBMOUNTLOOK;
- nd.ni_dirp = uap->link;
- error = namei(&nd);
- if (error != 0)
- goto out;
- dvp = nd.ni_dvp;
- lvp = nd.ni_vp;
-#if CONFIG_MACF
- if ((error = mac_vnode_check_link(ctx, dvp, vp, &nd.ni_cnd)) != 0)
- goto out2;
-#endif
+ fst.sfsp = sfsp;
+ fst.mp = mp;
+ fst.flags = uap->flags;
+ fst.count = 0;
+ fst.error = 0;
+ fst.maxcount = (int)maxcount;
- /* or to anything that kauth doesn't want us to (eg. immutable items) */
- if ((error = vnode_authorize(vp, NULL, KAUTH_VNODE_LINKTARGET, ctx)) != 0)
- goto out2;
- /* target node must not exist */
- if (lvp != NULLVP) {
- error = EEXIST;
- goto out2;
+ vfs_iterate(VFS_ITERATE_NOSKIP_UNMOUNT, getfsstat_callback, &fst);
+
+ if (mp) {
+ kheap_free(KHEAP_TEMP, mp, count * sizeof(user_addr_t));
}
- /* cannot link across mountpoints */
- if (vnode_mount(vp) != vnode_mount(dvp)) {
- error = EXDEV;
- goto out2;
- }
-
- /* authorize creation of the target note */
- if ((error = vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_FILE, ctx)) != 0)
- goto out2;
- /* and finally make the link */
- error = VNOP_LINK(vp, dvp, &nd.ni_cnd, ctx);
- if (error)
- goto out2;
+ if (fst.error) {
+ KAUTH_DEBUG("ERROR - %s gets %d", p->p_comm, fst.error);
+ return fst.error;
+ }
-#if CONFIG_FSE
- need_event = need_fsevent(FSE_CREATE_FILE, dvp);
-#else
- need_event = 0;
-#endif
- has_listeners = kauth_authorize_fileop_has_listeners();
+ if (fst.sfsp && fst.count > fst.maxcount) {
+ *retval = fst.maxcount;
+ } else {
+ *retval = fst.count;
+ }
+ return 0;
+}
- if (need_event || has_listeners) {
- char *link_to_path = NULL;
- int len, link_name_len;
+static int
+getfsstat64_callback(mount_t mp, void * arg)
+{
+ struct getfsstat_struct *fstp = (struct getfsstat_struct *)arg;
+ struct vfsstatfs *sp;
+ struct statfs64 sfs;
+ int error;
- /* build the path to the new link file */
- GET_PATH(target_path);
- if (target_path == NULL) {
- error = ENOMEM;
- goto out2;
+ if (fstp->sfsp && fstp->count < fstp->maxcount) {
+#if CONFIG_MACF
+ error = mac_mount_check_stat(vfs_context_current(), mp);
+ if (error != 0) {
+ fstp->error = error;
+ return VFS_RETURNED_DONE;
}
-
- len = MAXPATHLEN;
- vn_getpath(dvp, target_path, &len);
- if ((len + 1 + nd.ni_cnd.cn_namelen + 1) < MAXPATHLEN) {
- target_path[len-1] = '/';
- strlcpy(&target_path[len], nd.ni_cnd.cn_nameptr, MAXPATHLEN-len);
- len += nd.ni_cnd.cn_namelen;
+#endif
+ sp = &mp->mnt_vfsstat;
+ /*
+ * If MNT_NOWAIT is specified, do not refresh the fsstat
+ * cache. MNT_WAIT overrides MNT_NOWAIT.
+ *
+ * We treat MNT_DWAIT as MNT_WAIT for all instances of
+ * getfsstat, since the constants are out of the same
+ * namespace.
+ */
+ if ((mp->mnt_lflag & MNT_LDEAD) ||
+ ((((fstp->flags & MNT_NOWAIT) == 0) || (fstp->flags & (MNT_WAIT | MNT_DWAIT))) &&
+ (!(mp->mnt_lflag & MNT_LUNMOUNT)) &&
+ (error = vfs_update_vfsstat(mp, vfs_context_current(), VFS_USER_EVENT)))) {
+ KAUTH_DEBUG("vfs_update_vfsstat returned %d", error);
+ return VFS_RETURNED;
}
- if (has_listeners) {
- /* build the path to file we are linking to */
- GET_PATH(link_to_path);
- if (link_to_path == NULL) {
- error = ENOMEM;
- goto out2;
- }
-
- link_name_len = MAXPATHLEN;
- vn_getpath(vp, link_to_path, &link_name_len);
-
- /*
- * Call out to allow 3rd party notification of rename.
- * Ignore result of kauth_authorize_fileop call.
- */
- kauth_authorize_fileop(vfs_context_ucred(ctx), KAUTH_FILEOP_LINK,
- (uintptr_t)link_to_path, (uintptr_t)target_path);
- if (link_to_path != NULL) {
- RELEASE_PATH(link_to_path);
- }
- }
-#if CONFIG_FSE
- if (need_event) {
- /* construct fsevent */
- if (get_fse_info(vp, &finfo, ctx) == 0) {
- // build the path to the destination of the link
- add_fsevent(FSE_CREATE_FILE, ctx,
- FSE_ARG_STRING, len, target_path,
- FSE_ARG_FINFO, &finfo,
- FSE_ARG_DONE);
- }
+ vfs_get_statfs64(mp, &sfs);
+ error = copyout(&sfs, fstp->sfsp, sizeof(sfs));
+ if (error) {
+ fstp->error = error;
+ return VFS_RETURNED_DONE;
}
-#endif
- }
-out2:
- /*
- * nameidone has to happen before we vnode_put(dvp)
- * since it may need to release the fs_nodelock on the dvp
- */
- nameidone(&nd);
- if (target_path != NULL) {
- RELEASE_PATH(target_path);
+ fstp->sfsp += sizeof(sfs);
}
-out:
- if (lvp)
- vnode_put(lvp);
- if (dvp)
- vnode_put(dvp);
- vnode_put(vp);
- return (error);
+ fstp->count++;
+ return VFS_RETURNED;
}
/*
- * Make a symbolic link.
- *
- * We could add support for ACLs here too...
+ * Get statistics on all file systems in 64 bit mode.
*/
-/* ARGSUSED */
int
-symlink(proc_t p, struct symlink_args *uap, __unused register_t *retval)
+getfsstat64(__unused proc_t p, struct getfsstat64_args *uap, int *retval)
{
- struct vnode_attr va;
- char *path;
- int error;
- struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
- vnode_t vp, dvp;
- size_t dummy=0;
-
- MALLOC_ZONE(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
- error = copyinstr(uap->path, path, MAXPATHLEN, &dummy);
- if (error)
- goto out;
- AUDIT_ARG(text, path); /* This is the link string */
+ user_addr_t sfsp;
+ int count, maxcount;
+ struct getfsstat_struct fst;
- NDINIT(&nd, CREATE, LOCKPARENT | AUDITVNPATH1,
- UIO_USERSPACE, uap->link, ctx);
- error = namei(&nd);
- if (error)
- goto out;
- dvp = nd.ni_dvp;
- vp = nd.ni_vp;
+ maxcount = uap->bufsize / sizeof(struct statfs64);
- VATTR_INIT(&va);
- VATTR_SET(&va, va_type, VLNK);
- VATTR_SET(&va, va_mode, ACCESSPERMS & ~p->p_fd->fd_cmask);
-#if CONFIG_MACF
- error = mac_vnode_check_create(ctx,
- dvp, &nd.ni_cnd, &va);
-#endif
- if (error != 0) {
- goto skipit;
- }
+ sfsp = uap->buf;
+ count = 0;
- if (vp != NULL) {
- error = EEXIST;
- goto skipit;
+ fst.sfsp = sfsp;
+ fst.flags = uap->flags;
+ fst.count = 0;
+ fst.error = 0;
+ fst.maxcount = maxcount;
+
+ vfs_iterate(VFS_ITERATE_NOSKIP_UNMOUNT, getfsstat64_callback, &fst);
+
+ if (fst.error) {
+ KAUTH_DEBUG("ERROR - %s gets %d", p->p_comm, fst.error);
+ return fst.error;
}
- /* authorize */
- if (error == 0)
- error = vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_FILE, ctx);
- /* get default ownership, etc. */
- if (error == 0)
- error = vnode_authattr_new(dvp, &va, 0, ctx);
- if (error == 0)
- error = VNOP_SYMLINK(dvp, &vp, &nd.ni_cnd, &va, path, ctx);
+ if (fst.sfsp && fst.count > fst.maxcount) {
+ *retval = fst.maxcount;
+ } else {
+ *retval = fst.count;
+ }
- /* do fallback attribute handling */
- if (error == 0)
- error = vnode_setattr_fallback(vp, &va, ctx);
-
- if (error == 0) {
- int update_flags = 0;
+ return 0;
+}
- if (vp == NULL) {
- nd.ni_cnd.cn_nameiop = LOOKUP;
- nd.ni_cnd.cn_flags = 0;
- error = namei(&nd);
- vp = nd.ni_vp;
+/*
+ * gets the associated vnode with the file descriptor passed.
+ * as input
+ *
+ * INPUT
+ * ctx - vfs context of caller
+ * fd - file descriptor for which vnode is required.
+ * vpp - Pointer to pointer to vnode to be returned.
+ *
+ * The vnode is returned with an iocount so any vnode obtained
+ * by this call needs a vnode_put
+ *
+ */
+int
+vnode_getfromfd(vfs_context_t ctx, int fd, vnode_t *vpp)
+{
+ int error;
+ vnode_t vp;
+ struct fileproc *fp;
+ proc_t p = vfs_context_proc(ctx);
- if (vp == NULL)
- goto skipit;
- }
-
-#if 0 /* XXX - kauth_todo - is KAUTH_FILEOP_SYMLINK needed? */
- /* call out to allow 3rd party notification of rename.
- * Ignore result of kauth_authorize_fileop call.
- */
- if (kauth_authorize_fileop_has_listeners() &&
- namei(&nd) == 0) {
- char *new_link_path = NULL;
- int len;
-
- /* build the path to the new link file */
- new_link_path = get_pathbuff();
- len = MAXPATHLEN;
- vn_getpath(dvp, new_link_path, &len);
- if ((len + 1 + nd.ni_cnd.cn_namelen + 1) < MAXPATHLEN) {
- new_link_path[len - 1] = '/';
- strlcpy(&new_link_path[len], nd.ni_cnd.cn_nameptr, MAXPATHLEN-len);
- }
-
- kauth_authorize_fileop(vfs_context_ucred(ctx), KAUTH_FILEOP_SYMLINK,
- (uintptr_t)path, (uintptr_t)new_link_path);
- if (new_link_path != NULL)
- release_pathbuff(new_link_path);
- }
-#endif
- // Make sure the name & parent pointers are hooked up
- if (vp->v_name == NULL)
- update_flags |= VNODE_UPDATE_NAME;
- if (vp->v_parent == NULLVP)
- update_flags |= VNODE_UPDATE_PARENT;
-
- if (update_flags)
- vnode_update_identity(vp, dvp, nd.ni_cnd.cn_nameptr, nd.ni_cnd.cn_namelen, nd.ni_cnd.cn_hash, update_flags);
+ *vpp = NULLVP;
-#if CONFIG_FSE
- add_fsevent(FSE_CREATE_FILE, ctx,
- FSE_ARG_VNODE, vp,
- FSE_ARG_DONE);
-#endif
+ error = fp_getfvp(p, fd, &fp, &vp);
+ if (error) {
+ return error;
}
-skipit:
- /*
- * nameidone has to happen before we vnode_put(dvp)
- * since it may need to release the fs_nodelock on the dvp
- */
- nameidone(&nd);
-
- if (vp)
- vnode_put(vp);
- vnode_put(dvp);
-out:
- FREE_ZONE(path, MAXPATHLEN, M_NAMEI);
+ error = vnode_getwithref(vp);
+ if (error) {
+ (void)fp_drop(p, fd, fp, 0);
+ return error;
+ }
- return (error);
+ (void)fp_drop(p, fd, fp, 0);
+ *vpp = vp;
+ return error;
}
/*
- * Delete a whiteout from the filesystem.
+ * Wrapper function around namei to start lookup from a directory
+ * specified by a file descriptor ni_dirfd.
+ *
+ * In addition to all the errors returned by namei, this call can
+ * return ENOTDIR if the file descriptor does not refer to a directory.
+ * and EBADF if the file descriptor is not valid.
*/
-/* ARGSUSED */
-#warning XXX authorization not implmented for whiteouts
int
-undelete(__unused proc_t p, struct undelete_args *uap, __unused register_t *retval)
+nameiat(struct nameidata *ndp, int dirfd)
{
- int error;
- struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
- vnode_t vp, dvp;
+ if ((dirfd != AT_FDCWD) &&
+ !(ndp->ni_flag & NAMEI_CONTLOOKUP) &&
+ !(ndp->ni_cnd.cn_flags & USEDVP)) {
+ int error = 0;
+ char c;
+
+ if (UIO_SEG_IS_USER_SPACE(ndp->ni_segflg)) {
+ error = copyin(ndp->ni_dirp, &c, sizeof(char));
+ if (error) {
+ return error;
+ }
+ } else {
+ c = *((char *)(ndp->ni_dirp));
+ }
- NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT|AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- error = namei(&nd);
- if (error)
- return (error);
- dvp = nd.ni_dvp;
- vp = nd.ni_vp;
+ if (c != '/') {
+ vnode_t dvp_at;
- if (vp == NULLVP && (nd.ni_cnd.cn_flags & ISWHITEOUT)) {
- error = VNOP_WHITEOUT(dvp, &nd.ni_cnd, DELETE, ctx);
- } else
- error = EEXIST;
+ error = vnode_getfromfd(ndp->ni_cnd.cn_context, dirfd,
+ &dvp_at);
+ if (error) {
+ return error;
+ }
- /*
- * nameidone has to happen before we vnode_put(dvp)
- * since it may need to release the fs_nodelock on the dvp
- */
- nameidone(&nd);
+ if (vnode_vtype(dvp_at) != VDIR) {
+ vnode_put(dvp_at);
+ return ENOTDIR;
+ }
- if (vp)
- vnode_put(vp);
- vnode_put(dvp);
+ ndp->ni_dvp = dvp_at;
+ ndp->ni_cnd.cn_flags |= USEDVP;
+ error = namei(ndp);
+ ndp->ni_cnd.cn_flags &= ~USEDVP;
+ vnode_put(dvp_at);
+ return error;
+ }
+ }
- return (error);
+ return namei(ndp);
}
/*
- * Delete a name from the filesystem.
+ * Change current working directory to a given file descriptor.
*/
/* ARGSUSED */
-int
-unlink1(vfs_context_t ctx, struct nameidata *ndp, int nodelbusy)
+static int
+common_fchdir(proc_t p, struct fchdir_args *uap, int per_thread)
{
- vnode_t vp, dvp;
- int error;
- struct componentname *cnp;
- char *path = NULL;
- int len;
- fse_info finfo;
- int flags = 0;
- int need_event = 0;
- int has_listeners = 0;
-
- ndp->ni_cnd.cn_flags |= LOCKPARENT;
- cnp = &ndp->ni_cnd;
-
- error = namei(ndp);
- if (error)
- return (error);
- dvp = ndp->ni_dvp;
- vp = ndp->ni_vp;
+ struct filedesc *fdp = p->p_fd;
+ vnode_t vp;
+ vnode_t tdp;
+ vnode_t tvp;
+ struct mount *mp;
+ int error, should_put = 1;
+ vfs_context_t ctx = vfs_context_current();
- /* With Carbon delete semantics, busy files cannot be deleted */
- if (nodelbusy) {
- flags |= VNODE_REMOVE_NODELETEBUSY;
+ AUDIT_ARG(fd, uap->fd);
+ if (per_thread && uap->fd == -1) {
+ /*
+ * Switching back from per-thread to per process CWD; verify we
+ * in fact have one before proceeding. The only success case
+ * for this code path is to return 0 preemptively after zapping
+ * the thread structure contents.
+ */
+ thread_t th = vfs_context_thread(ctx);
+ if (th) {
+ uthread_t uth = get_bsdthread_info(th);
+ tvp = uth->uu_cdir;
+ uth->uu_cdir = NULLVP;
+ if (tvp != NULLVP) {
+ vnode_rele(tvp);
+ return 0;
+ }
+ }
+ return EBADF;
}
- /*
- * Normally, unlinking of directories is not supported.
- * However, some file systems may have limited support.
- */
- if ((vp->v_type == VDIR) &&
- !(vp->v_mount->mnt_vtable->vfc_vfsflags & VFC_VFSDIRLINKS)) {
- error = EPERM; /* POSIX */
+ if ((error = file_vnode(uap->fd, &vp))) {
+ return error;
}
-
- /*
- * The root of a mounted filesystem cannot be deleted.
- */
- if (vp->v_flag & VROOT) {
- error = EBUSY;
+ if ((error = vnode_getwithref(vp))) {
+ file_drop(uap->fd);
+ return error;
}
- if (error)
- goto out;
+ AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+
+ if (vp->v_type != VDIR) {
+ error = ENOTDIR;
+ goto out;
+ }
- /* authorize the delete operation */
#if CONFIG_MACF
- if (!error)
- error = mac_vnode_check_unlink(ctx,
- dvp, vp, cnp);
-#endif /* MAC */
- if (!error)
- error = vnode_authorize(vp, ndp->ni_dvp, KAUTH_VNODE_DELETE, ctx);
- if (error)
+ error = mac_vnode_check_chdir(ctx, vp);
+ if (error) {
goto out;
-
-#if CONFIG_FSE
- need_event = need_fsevent(FSE_DELETE, dvp);
- if (need_event) {
- if ((vp->v_flag & VISHARDLINK) == 0) {
- get_fse_info(vp, &finfo, ctx);
- }
}
#endif
- has_listeners = kauth_authorize_fileop_has_listeners();
- if (need_event || has_listeners) {
- GET_PATH(path);
- if (path == NULL) {
- error = ENOMEM;
- goto out;
- }
- len = MAXPATHLEN;
- vn_getpath(vp, path, &len);
+ error = vnode_authorize(vp, NULL, KAUTH_VNODE_SEARCH, ctx);
+ if (error) {
+ goto out;
}
-#if NAMEDRSRCFORK
- if (ndp->ni_cnd.cn_flags & CN_WANTSRSRCFORK)
- error = vnode_removenamedstream(dvp, vp, XATTR_RESOURCEFORK_NAME, 0, ctx);
- else
-#endif
- error = VNOP_REMOVE(dvp, vp, &ndp->ni_cnd, flags, ctx);
-
- /*
- * Call out to allow 3rd party notification of delete.
- * Ignore result of kauth_authorize_fileop call.
- */
- if (!error) {
- if (has_listeners) {
- kauth_authorize_fileop(vfs_context_ucred(ctx),
- KAUTH_FILEOP_DELETE,
- (uintptr_t)vp,
- (uintptr_t)path);
+ while (!error && (mp = vp->v_mountedhere) != NULL) {
+ if (vfs_busy(mp, LK_NOWAIT)) {
+ error = EACCES;
+ goto out;
}
-
- if (vp->v_flag & VISHARDLINK) {
- //
- // if a hardlink gets deleted we want to blow away the
- // v_parent link because the path that got us to this
- // instance of the link is no longer valid. this will
- // force the next call to get the path to ask the file
- // system instead of just following the v_parent link.
- //
- vnode_update_identity(vp, NULL, NULL, 0, 0, VNODE_UPDATE_PARENT);
+ error = VFS_ROOT(mp, &tdp, ctx);
+ vfs_unbusy(mp);
+ if (error) {
+ break;
}
+ vnode_put(vp);
+ vp = tdp;
+ }
+ if (error) {
+ goto out;
+ }
+ if ((error = vnode_ref(vp))) {
+ goto out;
+ }
+ vnode_put(vp);
+ should_put = 0;
-#if CONFIG_FSE
- if (need_event) {
- if (vp->v_flag & VISHARDLINK) {
- get_fse_info(vp, &finfo, ctx);
- }
- add_fsevent(FSE_DELETE, ctx,
- FSE_ARG_STRING, len, path,
- FSE_ARG_FINFO, &finfo,
- FSE_ARG_DONE);
+ if (per_thread) {
+ thread_t th = vfs_context_thread(ctx);
+ if (th) {
+ uthread_t uth = get_bsdthread_info(th);
+ tvp = uth->uu_cdir;
+ uth->uu_cdir = vp;
+ OSBitOrAtomic(P_THCWD, &p->p_flag);
+ } else {
+ vnode_rele(vp);
+ error = ENOENT;
+ goto out;
}
-#endif
+ } else {
+ proc_dirs_lock_exclusive(p);
+ proc_fdlock(p);
+ tvp = fdp->fd_cdir;
+ fdp->fd_cdir = vp;
+ proc_fdunlock(p);
+ proc_dirs_unlock_exclusive(p);
+ }
+
+ if (tvp) {
+ vnode_rele(tvp);
}
- if (path != NULL)
- RELEASE_PATH(path);
- /*
- * nameidone has to happen before we vnode_put(dvp)
- * since it may need to release the fs_nodelock on the dvp
- */
out:
- nameidone(ndp);
- vnode_put(dvp);
- vnode_put(vp);
- return (error);
+ if (should_put) {
+ vnode_put(vp);
+ }
+ file_drop(uap->fd);
+
+ return error;
}
-/*
- * Delete a name from the filesystem using POSIX semantics.
- */
int
-unlink(__unused proc_t p, struct unlink_args *uap, __unused register_t *retval)
+fchdir(proc_t p, struct fchdir_args *uap, __unused int32_t *retval)
{
- struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
-
- NDINIT(&nd, DELETE, AUDITVNPATH1, UIO_USERSPACE, uap->path, ctx);
- return unlink1(ctx, &nd, 0);
+ return common_fchdir(p, uap, 0);
}
-/*
- * Delete a name from the filesystem using Carbon semantics.
- */
int
-delete(__unused proc_t p, struct delete_args *uap, __unused register_t *retval)
+__pthread_fchdir(proc_t p, struct __pthread_fchdir_args *uap, __unused int32_t *retval)
{
- struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
-
- NDINIT(&nd, DELETE, AUDITVNPATH1, UIO_USERSPACE, uap->path, ctx);
- return unlink1(ctx, &nd, 1);
+ return common_fchdir(p, (void *)uap, 1);
}
+
/*
- * Reposition read/write file offset.
+ * Change current working directory (".").
+ *
+ * Returns: 0 Success
+ * change_dir:ENOTDIR
+ * change_dir:???
+ * vnode_ref:ENOENT No such file or directory
*/
+/* ARGSUSED */
int
-lseek(proc_t p, struct lseek_args *uap, off_t *retval)
+chdir_internal(proc_t p, vfs_context_t ctx, struct nameidata *ndp, int per_thread)
{
- struct fileproc *fp;
- vnode_t vp;
- struct vfs_context *ctx;
- off_t offset = uap->offset, file_size;
+ struct filedesc *fdp = p->p_fd;
int error;
+ vnode_t tvp;
- if ( (error = fp_getfvp(p,uap->fd, &fp, &vp)) ) {
- if (error == ENOTSUP)
- return (ESPIPE);
- return (error);
- }
- if (vnode_isfifo(vp)) {
- file_drop(uap->fd);
- return(ESPIPE);
- }
-
-
- ctx = vfs_context_current();
-#if CONFIG_MACF
- if (uap->whence == L_INCR && uap->offset == 0)
- error = mac_file_check_get_offset(vfs_context_ucred(ctx),
- fp->f_fglob);
- else
- error = mac_file_check_change_offset(vfs_context_ucred(ctx),
- fp->f_fglob);
+ error = change_dir(ndp, ctx);
if (error) {
- file_drop(uap->fd);
- return (error);
+ return error;
}
-#endif
- if ( (error = vnode_getwithref(vp)) ) {
- file_drop(uap->fd);
- return(error);
+ if ((error = vnode_ref(ndp->ni_vp))) {
+ vnode_put(ndp->ni_vp);
+ return error;
}
+ /*
+ * drop the iocount we picked up in change_dir
+ */
+ vnode_put(ndp->ni_vp);
- switch (uap->whence) {
- case L_INCR:
- offset += fp->f_fglob->fg_offset;
- break;
- case L_XTND:
- if ((error = vnode_size(vp, &file_size, ctx)) != 0)
- break;
- offset += file_size;
- break;
- case L_SET:
- break;
- default:
- error = EINVAL;
- }
- if (error == 0) {
- if (uap->offset > 0 && offset < 0) {
- /* Incremented/relative move past max size */
- error = EOVERFLOW;
+ if (per_thread) {
+ thread_t th = vfs_context_thread(ctx);
+ if (th) {
+ uthread_t uth = get_bsdthread_info(th);
+ tvp = uth->uu_cdir;
+ uth->uu_cdir = ndp->ni_vp;
+ OSBitOrAtomic(P_THCWD, &p->p_flag);
} else {
- /*
- * Allow negative offsets on character devices, per
- * POSIX 1003.1-2001. Most likely for writing disk
- * labels.
- */
- if (offset < 0 && vp->v_type != VCHR) {
- /* Decremented/relative move before start */
- error = EINVAL;
- } else {
- /* Success */
- fp->f_fglob->fg_offset = offset;
- *retval = fp->f_fglob->fg_offset;
- }
+ vnode_rele(ndp->ni_vp);
+ return ENOENT;
}
+ } else {
+ proc_dirs_lock_exclusive(p);
+ proc_fdlock(p);
+ tvp = fdp->fd_cdir;
+ fdp->fd_cdir = ndp->ni_vp;
+ proc_fdunlock(p);
+ proc_dirs_unlock_exclusive(p);
}
- (void)vnode_put(vp);
- file_drop(uap->fd);
- return (error);
+
+ if (tvp) {
+ vnode_rele(tvp);
+ }
+
+ return 0;
}
/*
- * Check access permissions.
+ * Change current working directory (".").
*
* Returns: 0 Success
- * vnode_authorize:???
+ * chdir_internal:ENOTDIR
+ * chdir_internal:ENOENT No such file or directory
+ * chdir_internal:???
*/
+/* ARGSUSED */
static int
-access1(vnode_t vp, vnode_t dvp, int uflags, vfs_context_t ctx)
+common_chdir(proc_t p, struct chdir_args *uap, int per_thread)
{
- kauth_action_t action;
- int error;
-
- /*
- * If just the regular access bits, convert them to something
- * that vnode_authorize will understand.
- */
- if (!(uflags & _ACCESS_EXTENDED_MASK)) {
- action = 0;
- if (uflags & R_OK)
- action |= KAUTH_VNODE_READ_DATA; /* aka KAUTH_VNODE_LIST_DIRECTORY */
- if (uflags & W_OK) {
- if (vnode_isdir(vp)) {
- action |= KAUTH_VNODE_ADD_FILE |
- KAUTH_VNODE_ADD_SUBDIRECTORY;
- /* might want delete rights here too */
- } else {
- action |= KAUTH_VNODE_WRITE_DATA;
- }
- }
- if (uflags & X_OK) {
- if (vnode_isdir(vp)) {
- action |= KAUTH_VNODE_SEARCH;
- } else {
- action |= KAUTH_VNODE_EXECUTE;
- }
- }
- } else {
- /* take advantage of definition of uflags */
- action = uflags >> 8;
- }
-
-#if CONFIG_MACF
- error = mac_vnode_check_access(ctx, vp, uflags);
- if (error)
- return (error);
-#endif /* MAC */
+ struct nameidata nd;
+ vfs_context_t ctx = vfs_context_current();
- /* action == 0 means only check for existence */
- if (action != 0) {
- error = vnode_authorize(vp, dvp, action | KAUTH_VNODE_ACCESS, ctx);
- } else {
- error = 0;
- }
+ NDINIT(&nd, LOOKUP, OP_CHDIR, FOLLOW | AUDITVNPATH1,
+ UIO_USERSPACE, uap->path, ctx);
- return(error);
+ return chdir_internal(p, ctx, &nd, per_thread);
}
-
/*
- * access_extended
+ * chdir
*
- * Description: uap->entries Pointer to argument descriptor
- * uap->size Size of the area pointed to by
- * the descriptor
- * uap->results Pointer to the results array
+ * Change current working directory (".") for the entire process
+ *
+ * Parameters: p Process requesting the call
+ * uap User argument descriptor (see below)
+ * retval (ignored)
+ *
+ * Indirect parameters: uap->path Directory path
*
* Returns: 0 Success
- * ENOMEM Insufficient memory
- * EINVAL Invalid arguments
- * namei:EFAULT Bad address
- * namei:ENAMETOOLONG Filename too long
- * namei:ENOENT No such file or directory
- * namei:ELOOP Too many levels of symbolic links
- * namei:EBADF Bad file descriptor
- * namei:ENOTDIR Not a directory
- * namei:???
- * access1:
+ * common_chdir: ENOTDIR
+ * common_chdir: ENOENT No such file or directory
+ * common_chdir: ???
*
- * Implicit returns:
- * uap->results Array contents modified
+ */
+int
+chdir(proc_t p, struct chdir_args *uap, __unused int32_t *retval)
+{
+ return common_chdir(p, (void *)uap, 0);
+}
+
+/*
+ * __pthread_chdir
*
- * Notes: The uap->entries are structured as an arbitrary length array
- * of accessx descriptors, followed by one or more NULL terniated
- * strings
+ * Change current working directory (".") for a single thread
*
- * struct accessx_descriptor[0]
- * ...
- * struct accessx_descriptor[n]
- * char name_data[0];
+ * Parameters: p Process requesting the call
+ * uap User argument descriptor (see below)
+ * retval (ignored)
*
- * We determine the entry count by walking the buffer containing
- * the uap->entries argument descriptor. For each descrptor we
- * see, the valid values for the offset ad_name_offset will be
- * in the byte range:
+ * Indirect parameters: uap->path Directory path
*
- * [ uap->entries + sizeof(struct accessx_descriptor) ]
- * to
- * [ uap->entries + uap->size - 2 ]
+ * Returns: 0 Success
+ * common_chdir: ENOTDIR
+ * common_chdir: ENOENT No such file or directory
+ * common_chdir: ???
*
- * since we must have at least one string, and the string must
- * be at least one character plus the NUL terminator in length.
- *
- * XXX: Need to support the check-as uid argument
*/
int
-access_extended(__unused proc_t p, struct access_extended_args *uap, __unused register_t *retval)
+__pthread_chdir(proc_t p, struct __pthread_chdir_args *uap, __unused int32_t *retval)
{
- struct accessx_descriptor *input = NULL;
- errno_t *result = NULL;
- errno_t error = 0;
- int wantdelete = 0;
- unsigned int desc_max, desc_actual, i, j;
- struct vfs_context context;
- struct nameidata nd;
- int niopts;
- vnode_t vp = NULL;
- vnode_t dvp = NULL;
-#define ACCESSX_MAX_DESCR_ON_STACK 10
- struct accessx_descriptor stack_input[ACCESSX_MAX_DESCR_ON_STACK];
+ return common_chdir(p, (void *)uap, 1);
+}
- context.vc_ucred = NULL;
- /*
- * Validate parameters; if valid, copy the descriptor array and string
- * arguments into local memory. Before proceeding, the following
- * conditions must have been met:
- *
- * o The total size is not permitted to exceed ACCESSX_MAX_TABLESIZE
- * o There must be sufficient room in the request for at least one
- * descriptor and a one yte NUL terminated string.
- * o The allocation of local storage must not fail.
- */
- if (uap->size > ACCESSX_MAX_TABLESIZE)
- return(ENOMEM);
- if (uap->size < (sizeof(struct accessx_descriptor) + 2))
- return(EINVAL);
- if (uap->size <= sizeof (stack_input)) {
- input = stack_input;
- } else {
- MALLOC(input, struct accessx_descriptor *, uap->size, M_TEMP, M_WAITOK);
- if (input == NULL) {
- error = ENOMEM;
- goto out;
+/*
+ * Change notion of root (``/'') directory.
+ */
+/* ARGSUSED */
+int
+chroot(proc_t p, struct chroot_args *uap, __unused int32_t *retval)
+{
+ struct filedesc *fdp = p->p_fd;
+ int error;
+ struct nameidata nd;
+ vnode_t tvp;
+ vfs_context_t ctx = vfs_context_current();
+
+ if ((error = suser(kauth_cred_get(), &p->p_acflag))) {
+ return error;
}
+
+ NDINIT(&nd, LOOKUP, OP_CHROOT, FOLLOW | AUDITVNPATH1,
+ UIO_USERSPACE, uap->path, ctx);
+ error = change_dir(&nd, ctx);
+ if (error) {
+ return error;
}
- error = copyin(uap->entries, input, uap->size);
- if (error)
- goto out;
- /*
- * Force NUL termination of the copyin buffer to avoid nami() running
- * off the end. If the caller passes us bogus data, they may get a
- * bogus result.
- */
- ((char *)input)[uap->size - 1] = 0;
+#if CONFIG_MACF
+ error = mac_vnode_check_chroot(ctx, nd.ni_vp,
+ &nd.ni_cnd);
+ if (error) {
+ vnode_put(nd.ni_vp);
+ return error;
+ }
+#endif
- /*
- * Access is defined as checking against the process' real identity,
- * even if operations are checking the effective identity. This
- * requires that we use a local vfs context.
- */
- context.vc_ucred = kauth_cred_copy_real(kauth_cred_get());
- context.vc_thread = current_thread();
+ if ((error = vnode_ref(nd.ni_vp))) {
+ vnode_put(nd.ni_vp);
+ return error;
+ }
+ vnode_put(nd.ni_vp);
/*
- * Find out how many entries we have, so we can allocate the result
- * array by walking the list and adjusting the count downward by the
- * earliest string offset we see.
+ * This lock provides the guarantee that as long as you hold the lock
+ * fdp->fd_rdir has a usecount on it. This is used to take an iocount
+ * on a referenced vnode in namei when determining the rootvnode for
+ * a process.
*/
- desc_max = (uap->size - 2) / sizeof(struct accessx_descriptor);
- desc_actual = desc_max;
- for (i = 0; i < desc_actual; i++) {
- /*
- * Take the offset to the name string for this entry and
- * convert to an input array index, which would be one off
- * the end of the array if this entry was the lowest-addressed
- * name string.
- */
- j = input[i].ad_name_offset / sizeof(struct accessx_descriptor);
+ /* needed for synchronization with lookup */
+ proc_dirs_lock_exclusive(p);
+ /* needed for setting the flag and other activities on the fd itself */
+ proc_fdlock(p);
+ tvp = fdp->fd_rdir;
+ fdp->fd_rdir = nd.ni_vp;
+ fdp->fd_flags |= FD_CHROOT;
+ proc_fdunlock(p);
+ proc_dirs_unlock_exclusive(p);
- /*
- * An offset greater than the max allowable offset is an error.
- * It is also an error for any valid entry to point
- * to a location prior to the end of the current entry, if
- * it's not a reference to the string of the previous entry.
- */
- if (j > desc_max || (j != 0 && j <= i)) {
- error = EINVAL;
- goto out;
- }
+ if (tvp != NULL) {
+ vnode_rele(tvp);
+ }
- /*
- * An offset of 0 means use the previous descriptor's offset;
- * this is used to chain multiple requests for the same file
- * to avoid multiple lookups.
- */
- if (j == 0) {
- /* This is not valid for the first entry */
- if (i == 0) {
- error = EINVAL;
- goto out;
- }
- continue;
- }
+ return 0;
+}
- /*
- * If the offset of the string for this descriptor is before
- * what we believe is the current actual last descriptor,
- * then we need to adjust our estimate downward; this permits
- * the string table following the last descriptor to be out
- * of order relative to the descriptor list.
- */
- if (j < desc_actual)
- desc_actual = j;
+#define PATHSTATICBUFLEN 256
+#define PIVOT_ROOT_ENTITLEMENT \
+ "com.apple.private.vfs.pivot-root"
+
+#if defined(XNU_TARGET_OS_OSX)
+int
+pivot_root(proc_t p, struct pivot_root_args *uap, __unused int *retval)
+{
+ int error;
+ char new_rootfs_path_before[PATHSTATICBUFLEN] = {0};
+ char old_rootfs_path_after[PATHSTATICBUFLEN] = {0};
+ char *new_rootfs_path_before_buf = NULL;
+ char *old_rootfs_path_after_buf = NULL;
+ char *incoming = NULL;
+ char *outgoing = NULL;
+ vnode_t incoming_rootvp = NULLVP;
+ size_t bytes_copied;
+
+ /*
+ * XXX : Additional restrictions needed
+ * - perhaps callable only once.
+ */
+ if ((error = suser(kauth_cred_get(), &p->p_acflag))) {
+ return error;
}
/*
- * We limit the actual number of descriptors we are willing to process
- * to a hard maximum of ACCESSX_MAX_DESCRIPTORS. If the number being
- * requested does not exceed this limit,
+ * pivot_root can be executed by launchd only.
+ * Enforce entitlement.
*/
- if (desc_actual > ACCESSX_MAX_DESCRIPTORS) {
- error = ENOMEM;
+ if ((p->p_pid != 1) || !IOTaskHasEntitlement(current_task(), PIVOT_ROOT_ENTITLEMENT)) {
+ return EPERM;
+ }
+
+ error = copyinstr(uap->new_rootfs_path_before, &new_rootfs_path_before[0], PATHSTATICBUFLEN, &bytes_copied);
+ if (error == ENAMETOOLONG) {
+ new_rootfs_path_before_buf = zalloc_flags(ZV_NAMEI, Z_WAITOK);
+ error = copyinstr(uap->new_rootfs_path_before, new_rootfs_path_before_buf, MAXPATHLEN, &bytes_copied);
+ }
+
+ if (error) {
goto out;
}
- MALLOC(result, errno_t *, desc_actual * sizeof(errno_t), M_TEMP, M_WAITOK);
- if (result == NULL) {
- error = ENOMEM;
+
+ error = copyinstr(uap->old_rootfs_path_after, &old_rootfs_path_after[0], PATHSTATICBUFLEN, &bytes_copied);
+ if (error == ENAMETOOLONG) {
+ old_rootfs_path_after_buf = zalloc_flags(ZV_NAMEI, Z_WAITOK);
+ error = copyinstr(uap->old_rootfs_path_after, old_rootfs_path_after_buf, MAXPATHLEN, &bytes_copied);
+ }
+ if (error) {
goto out;
}
+ if (new_rootfs_path_before_buf) {
+ incoming = new_rootfs_path_before_buf;
+ } else {
+ incoming = &new_rootfs_path_before[0];
+ }
+
+ if (old_rootfs_path_after_buf) {
+ outgoing = old_rootfs_path_after_buf;
+ } else {
+ outgoing = &old_rootfs_path_after[0];
+ }
+
/*
- * Do the work by iterating over the descriptor entries we know to
- * at least appear to contain valid data.
+ * The proposed incoming FS MUST be authenticated (i.e. not a chunklist DMG).
+ * Userland is not allowed to pivot to an image.
*/
- error = 0;
- for (i = 0; i < desc_actual; i++) {
- /*
- * If the ad_name_offset is 0, then we use the previous
- * results to make the check; otherwise, we are looking up
- * a new file name.
- */
- if (input[i].ad_name_offset != 0) {
- /* discard old vnodes */
- if (vp) {
- vnode_put(vp);
- vp = NULL;
- }
- if (dvp) {
- vnode_put(dvp);
- dvp = NULL;
- }
-
- /*
- * Scan forward in the descriptor list to see if we
- * need the parent vnode. We will need it if we are
- * deleting, since we must have rights to remove
- * entries in the parent directory, as well as the
- * rights to delete the object itself.
- */
- wantdelete = input[i].ad_flags & _DELETE_OK;
- for (j = i + 1; (j < desc_actual) && (input[j].ad_name_offset == 0); j++)
- if (input[j].ad_flags & _DELETE_OK)
- wantdelete = 1;
-
- niopts = FOLLOW | AUDITVNPATH1;
+ error = vnode_lookup(incoming, 0, &incoming_rootvp, vfs_context_kernel());
+ if (error) {
+ goto out;
+ }
+ error = VNOP_IOCTL(incoming_rootvp, FSIOC_KERNEL_ROOTAUTH, NULL, 0, vfs_context_kernel());
+ if (error) {
+ goto out;
+ }
- /* need parent for vnode_authorize for deletion test */
- if (wantdelete)
- niopts |= WANTPARENT;
+ error = vfs_switch_root(incoming, outgoing, VFSSR_VIRTUALDEV_PROHIBITED);
- /* do the lookup */
- NDINIT(&nd, LOOKUP, niopts, UIO_SYSSPACE, CAST_USER_ADDR_T(((const char *)input) + input[i].ad_name_offset), &context);
- error = namei(&nd);
- if (!error) {
- vp = nd.ni_vp;
- if (wantdelete)
- dvp = nd.ni_dvp;
- }
- nameidone(&nd);
- }
+out:
+ if (incoming_rootvp != NULLVP) {
+ vnode_put(incoming_rootvp);
+ incoming_rootvp = NULLVP;
+ }
- /*
- * Handle lookup errors.
- */
- switch(error) {
- case ENOENT:
- case EACCES:
- case EPERM:
- case ENOTDIR:
- result[i] = error;
- break;
- case 0:
- /* run this access check */
- result[i] = access1(vp, dvp, input[i].ad_flags, &context);
- break;
- default:
- /* fatal lookup error */
+ if (old_rootfs_path_after_buf) {
+ zfree(ZV_NAMEI, old_rootfs_path_after_buf);
+ }
- goto out;
- }
+ if (new_rootfs_path_before_buf) {
+ zfree(ZV_NAMEI, new_rootfs_path_before_buf);
}
- /* copy out results */
- error = copyout(result, uap->results, desc_actual * sizeof(errno_t));
-
-out:
- if (input && input != stack_input)
- FREE(input, M_TEMP);
- if (result)
- FREE(result, M_TEMP);
- if (vp)
- vnode_put(vp);
- if (dvp)
- vnode_put(dvp);
- if (IS_VALID_CRED(context.vc_ucred))
- kauth_cred_unref(&context.vc_ucred);
- return(error);
+ return error;
}
-
+#else
+int
+pivot_root(proc_t p, __unused struct pivot_root_args *uap, int *retval)
+{
+ return nosys(p, NULL, retval);
+}
+#endif /* XNU_TARGET_OS_OSX */
/*
+ * Common routine for chroot and chdir.
+ *
* Returns: 0 Success
- * namei:EFAULT Bad address
- * namei:ENAMETOOLONG Filename too long
- * namei:ENOENT No such file or directory
- * namei:ELOOP Too many levels of symbolic links
- * namei:EBADF Bad file descriptor
- * namei:ENOTDIR Not a directory
- * namei:???
- * access1:
+ * ENOTDIR Not a directory
+ * namei:??? [anything namei can return]
+ * vnode_authorize:??? [anything vnode_authorize can return]
*/
-int
-access(__unused proc_t p, struct access_args *uap, __unused register_t *retval)
+static int
+change_dir(struct nameidata *ndp, vfs_context_t ctx)
{
+ vnode_t vp;
int error;
- struct nameidata nd;
- int niopts;
- struct vfs_context context;
-
-#if NAMEDRSRCFORK
- int is_namedstream = 0;
-#endif
- /*
- * Access is defined as checking against the process'
- * real identity, even if operations are checking the
- * effective identity. So we need to tweak the credential
- * in the context.
- */
- context.vc_ucred = kauth_cred_copy_real(kauth_cred_get());
- context.vc_thread = current_thread();
+ if ((error = namei(ndp))) {
+ return error;
+ }
+ nameidone(ndp);
+ vp = ndp->ni_vp;
- niopts = FOLLOW | AUDITVNPATH1;
- /* need parent for vnode_authorize for deletion test */
- if (uap->flags & _DELETE_OK)
- niopts |= WANTPARENT;
- NDINIT(&nd, LOOKUP, niopts, UIO_USERSPACE, uap->path, &context);
+ if (vp->v_type != VDIR) {
+ vnode_put(vp);
+ return ENOTDIR;
+ }
-#if NAMEDRSRCFORK
- /* access(F_OK) calls are allowed for resource forks. */
- if (uap->flags == F_OK)
- nd.ni_cnd.cn_flags |= CN_ALLOWRSRCFORK;
+#if CONFIG_MACF
+ error = mac_vnode_check_chdir(ctx, vp);
+ if (error) {
+ vnode_put(vp);
+ return error;
+ }
#endif
- error = namei(&nd);
- if (error)
- goto out;
-#if NAMEDRSRCFORK
- /* Grab reference on the shadow stream file vnode to
- * force an inactive on release which will mark it for
- * recycle
- */
- if (vnode_isnamedstream(nd.ni_vp) &&
- (nd.ni_vp->v_parent != NULLVP) &&
- ((nd.ni_vp->v_parent->v_mount->mnt_kern_flag & MNTK_NAMED_STREAMS) == 0)) {
- is_namedstream = 1;
- vnode_ref(nd.ni_vp);
+ error = vnode_authorize(vp, NULL, KAUTH_VNODE_SEARCH, ctx);
+ if (error) {
+ vnode_put(vp);
+ return error;
}
-#endif
- error = access1(nd.ni_vp, nd.ni_dvp, uap->flags, &context);
-
-#if NAMEDRSRCFORK
- if (is_namedstream) {
- vnode_rele(nd.ni_vp);
- }
-#endif
+ return error;
+}
- vnode_put(nd.ni_vp);
- if (uap->flags & _DELETE_OK)
- vnode_put(nd.ni_dvp);
- nameidone(&nd);
-
-out:
- kauth_cred_unref(&context.vc_ucred);
- return(error);
+/*
+ * Free the vnode data (for directories) associated with the file glob.
+ */
+struct fd_vn_data *
+fg_vn_data_alloc(void)
+{
+ struct fd_vn_data *fvdata;
+
+ /* Allocate per fd vnode data */
+ fvdata = kheap_alloc(KM_FD_VN_DATA, sizeof(struct fd_vn_data),
+ Z_WAITOK | Z_ZERO);
+ lck_mtx_init(&fvdata->fv_lock, fd_vn_lck_grp, fd_vn_lck_attr);
+ return fvdata;
}
+/*
+ * Free the vnode data (for directories) associated with the file glob.
+ */
+void
+fg_vn_data_free(void *fgvndata)
+{
+ struct fd_vn_data *fvdata = (struct fd_vn_data *)fgvndata;
+
+ kheap_free(KHEAP_DATA_BUFFERS, fvdata->fv_buf, fvdata->fv_bufallocsiz);
+ lck_mtx_destroy(&fvdata->fv_lock, fd_vn_lck_grp);
+ kheap_free(KM_FD_VN_DATA, fvdata, sizeof(struct fd_vn_data));
+}
/*
+ * Check permissions, allocate an open file structure,
+ * and call the device open routine if any.
+ *
* Returns: 0 Success
- * EFAULT
- * copyout:EFAULT
- * namei:???
- * vn_stat:???
+ * EINVAL
+ * EINTR
+ * falloc:ENFILE
+ * falloc:EMFILE
+ * falloc:ENOMEM
+ * vn_open_auth:???
+ * dupfdopen:???
+ * VNOP_ADVLOCK:???
+ * vnode_setsize:???
+ *
+ * XXX Need to implement uid, gid
*/
-static int
-stat2(vfs_context_t ctx, struct nameidata *ndp, user_addr_t ub, user_addr_t xsecurity, user_addr_t xsecurity_size, int isstat64)
+int
+open1(vfs_context_t ctx, struct nameidata *ndp, int uflags,
+ struct vnode_attr *vap, fp_allocfn_t fp_zalloc, void *cra,
+ int32_t *retval)
{
- struct stat sb;
- struct stat64 sb64;
- struct user_stat user_sb;
- struct user_stat64 user_sb64;
- caddr_t sbp;
- int error, my_size;
- kauth_filesec_t fsec;
- size_t xsecurity_bufsize;
- void * statptr;
+ proc_t p = vfs_context_proc(ctx);
+ uthread_t uu = get_bsdthread_info(vfs_context_thread(ctx));
+ struct fileproc *fp;
+ vnode_t vp;
+ int flags, oflags;
+ int type, indx, error;
+ struct vfs_context context;
-#if NAMEDRSRCFORK
- int is_namedstream = 0;
- /* stat calls are allowed for resource forks. */
- ndp->ni_cnd.cn_flags |= CN_ALLOWRSRCFORK;
-#endif
- error = namei(ndp);
- if (error)
- return (error);
- fsec = KAUTH_FILESEC_NONE;
- if (isstat64 != 0)
- statptr = (void *)&sb64;
- else
- statptr = (void *)&sb;
+ oflags = uflags;
-#if NAMEDRSRCFORK
- /* Grab reference on the shadow stream file vnode to
- * force an inactive on release which will mark it for
- * recycle.
- */
- if (vnode_isnamedstream(ndp->ni_vp) &&
- (ndp->ni_vp->v_parent != NULLVP) &&
- ((ndp->ni_vp->v_parent->v_mount->mnt_kern_flag & MNTK_NAMED_STREAMS) == 0)) {
- is_namedstream = 1;
- vnode_ref (ndp->ni_vp);
+ if ((oflags & O_ACCMODE) == O_ACCMODE) {
+ return EINVAL;
}
-#endif
- error = vn_stat(ndp->ni_vp, statptr, (xsecurity != USER_ADDR_NULL ? &fsec : NULL), isstat64, ctx);
+ flags = FFLAGS(uflags);
+ CLR(flags, FENCRYPTED);
+ CLR(flags, FUNENCRYPTED);
-#if NAMEDRSRCFORK
- if (is_namedstream) {
- vnode_rele (ndp->ni_vp);
+ AUDIT_ARG(fflags, oflags);
+ AUDIT_ARG(mode, vap->va_mode);
+
+ if ((error = falloc_withalloc(p,
+ &fp, &indx, ctx, fp_zalloc, cra)) != 0) {
+ return error;
}
-#endif
-
- vnode_put(ndp->ni_vp);
- nameidone(ndp);
+ uu->uu_dupfd = -indx - 1;
- if (error)
- return (error);
- /* Zap spare fields */
- if (isstat64 != 0) {
- sb64.st_lspare = 0;
- sb64.st_qspare[0] = 0LL;
- sb64.st_qspare[1] = 0LL;
- if (IS_64BIT_PROCESS(vfs_context_proc(ctx))) {
- munge_stat64(&sb64, &user_sb64);
- my_size = sizeof(user_sb64);
- sbp = (caddr_t)&user_sb64;
- } else {
- my_size = sizeof(sb64);
- sbp = (caddr_t)&sb64;
+ if ((error = vn_open_auth(ndp, &flags, vap))) {
+ if ((error == ENODEV || error == ENXIO) && (uu->uu_dupfd >= 0)) { /* XXX from fdopen */
+ if ((error = dupfdopen(p->p_fd, indx, uu->uu_dupfd, flags, error)) == 0) {
+ fp_drop(p, indx, NULL, 0);
+ *retval = indx;
+ return 0;
+ }
}
- /*
- * Check if we raced (post lookup) against the last unlink of a file.
- */
- if ((sb64.st_nlink == 0) && S_ISREG(sb64.st_mode)) {
- sb64.st_nlink = 1;
+ if (error == ERESTART) {
+ error = EINTR;
}
- } else {
- sb.st_lspare = 0;
- sb.st_qspare[0] = 0LL;
- sb.st_qspare[1] = 0LL;
- if (IS_64BIT_PROCESS(vfs_context_proc(ctx))) {
- munge_stat(&sb, &user_sb);
- my_size = sizeof(user_sb);
- sbp = (caddr_t)&user_sb;
+ fp_free(p, indx, fp);
+ return error;
+ }
+ uu->uu_dupfd = 0;
+ vp = ndp->ni_vp;
+
+ fp->fp_glob->fg_flag = flags & (FMASK | O_EVTONLY | FENCRYPTED | FUNENCRYPTED);
+ fp->fp_glob->fg_ops = &vnops;
+ fp->fp_glob->fg_data = (caddr_t)vp;
+
+ if (flags & (O_EXLOCK | O_SHLOCK)) {
+ struct flock lf = {
+ .l_whence = SEEK_SET,
+ };
+
+ if (flags & O_EXLOCK) {
+ lf.l_type = F_WRLCK;
} else {
- my_size = sizeof(sb);
- sbp = (caddr_t)&sb;
+ lf.l_type = F_RDLCK;
}
-
- /*
- * Check if we raced (post lookup) against the last unlink of a file.
- */
- if ((sb.st_nlink == 0) && S_ISREG(sb.st_mode)) {
- sb.st_nlink = 1;
+ type = F_FLOCK;
+ if ((flags & FNONBLOCK) == 0) {
+ type |= F_WAIT;
+ }
+#if CONFIG_MACF
+ error = mac_file_check_lock(vfs_context_ucred(ctx), fp->fp_glob,
+ F_SETLK, &lf);
+ if (error) {
+ goto bad;
+ }
+#endif
+ if ((error = VNOP_ADVLOCK(vp, (caddr_t)fp->fp_glob, F_SETLK, &lf, type, ctx, NULL))) {
+ goto bad;
}
+ fp->fp_glob->fg_flag |= FWASLOCKED;
}
- if ((error = copyout(sbp, ub, my_size)) != 0)
- goto out;
- /* caller wants extended security information? */
- if (xsecurity != USER_ADDR_NULL) {
+ /* try to truncate by setting the size attribute */
+ if ((flags & O_TRUNC) && ((error = vnode_setsize(vp, (off_t)0, 0, ctx)) != 0)) {
+ goto bad;
+ }
- /* did we get any? */
- if (fsec == KAUTH_FILESEC_NONE) {
- if (susize(xsecurity_size, 0) != 0) {
- error = EFAULT;
- goto out;
- }
- } else {
- /* find the user buffer size */
- xsecurity_bufsize = fusize(xsecurity_size);
+ /*
+ * For directories we hold some additional information in the fd.
+ */
+ if (vnode_vtype(vp) == VDIR) {
+ fp->fp_glob->fg_vn_data = fg_vn_data_alloc();
+ } else {
+ fp->fp_glob->fg_vn_data = NULL;
+ }
- /* copy out the actual data size */
- if (susize(xsecurity_size, KAUTH_FILESEC_COPYSIZE(fsec)) != 0) {
- error = EFAULT;
- goto out;
- }
+ vnode_put(vp);
- /* if the caller supplied enough room, copy out to it */
- if (xsecurity_bufsize >= KAUTH_FILESEC_COPYSIZE(fsec))
- error = copyout(fsec, xsecurity, KAUTH_FILESEC_COPYSIZE(fsec));
+ /*
+ * The first terminal open (without a O_NOCTTY) by a session leader
+ * results in it being set as the controlling terminal.
+ */
+ if (vnode_istty(vp) && !(p->p_flag & P_CONTROLT) &&
+ !(flags & O_NOCTTY)) {
+ int tmp = 0;
+
+ (void)(*fp->fp_glob->fg_ops->fo_ioctl)(fp, (int)TIOCSCTTY,
+ (caddr_t)&tmp, ctx);
+ }
+
+ proc_fdlock(p);
+ if (flags & O_CLOEXEC) {
+ *fdflags(p, indx) |= UF_EXCLOSE;
+ }
+ if (flags & O_CLOFORK) {
+ *fdflags(p, indx) |= UF_FORKCLOSE;
+ }
+ procfdtbl_releasefd(p, indx, NULL);
+
+#if CONFIG_SECLUDED_MEMORY
+ if (secluded_for_filecache &&
+ FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_VNODE &&
+ vnode_vtype(vp) == VREG) {
+ memory_object_control_t moc;
+
+ moc = ubc_getobject(vp, UBC_FLAGS_NONE);
+
+ if (moc == MEMORY_OBJECT_CONTROL_NULL) {
+ /* nothing to do... */
+ } else if (fp->fp_glob->fg_flag & FWRITE) {
+ /* writable -> no longer eligible for secluded pages */
+ memory_object_mark_eligible_for_secluded(moc,
+ FALSE);
+ } else if (secluded_for_filecache == 1) {
+ char pathname[32] = { 0, };
+ size_t copied;
+ /* XXX FBDP: better way to detect /Applications/ ? */
+ if (UIO_SEG_IS_USER_SPACE(ndp->ni_segflg)) {
+ (void)copyinstr(ndp->ni_dirp,
+ pathname,
+ sizeof(pathname),
+ &copied);
+ } else {
+ copystr(CAST_DOWN(void *, ndp->ni_dirp),
+ pathname,
+ sizeof(pathname),
+ &copied);
+ }
+ pathname[sizeof(pathname) - 1] = '\0';
+ if (strncmp(pathname,
+ "/Applications/",
+ strlen("/Applications/")) == 0 &&
+ strncmp(pathname,
+ "/Applications/Camera.app/",
+ strlen("/Applications/Camera.app/")) != 0) {
+ /*
+ * not writable
+ * AND from "/Applications/"
+ * AND not from "/Applications/Camera.app/"
+ * ==> eligible for secluded
+ */
+ memory_object_mark_eligible_for_secluded(moc,
+ TRUE);
+ }
+ } else if (secluded_for_filecache == 2) {
+#if __arm64__
+#define DYLD_SHARED_CACHE_NAME "dyld_shared_cache_arm64"
+#elif __arm__
+#define DYLD_SHARED_CACHE_NAME "dyld_shared_cache_armv7"
+#else
+/* not implemented... */
+#endif
+ size_t len = strlen(vp->v_name);
+ if (!strncmp(vp->v_name, DYLD_SHARED_CACHE_NAME, len) ||
+ !strncmp(vp->v_name, "dyld", len) ||
+ !strncmp(vp->v_name, "launchd", len) ||
+ !strncmp(vp->v_name, "Camera", len) ||
+ !strncmp(vp->v_name, "mediaserverd", len) ||
+ !strncmp(vp->v_name, "SpringBoard", len) ||
+ !strncmp(vp->v_name, "backboardd", len)) {
+ /*
+ * This file matters when launching Camera:
+ * do not store its contents in the secluded
+ * pool that will be drained on Camera launch.
+ */
+ memory_object_mark_eligible_for_secluded(moc,
+ FALSE);
+ }
}
}
-out:
- if (fsec != KAUTH_FILESEC_NONE)
- kauth_filesec_free(fsec);
- return (error);
-}
+#endif /* CONFIG_SECLUDED_MEMORY */
-/*
- * Get file status; this version follows links.
- *
- * Returns: 0 Success
- * stat2:??? [see stat2() in this file]
- */
-static int
-stat1(user_addr_t path, user_addr_t ub, user_addr_t xsecurity, user_addr_t xsecurity_size, int isstat64)
-{
- struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
+ fp_drop(p, indx, fp, 1);
+ proc_fdunlock(p);
- NDINIT(&nd, LOOKUP, NOTRIGGER | FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, path, ctx);
- return(stat2(ctx, &nd, ub, xsecurity, xsecurity_size, isstat64));
-}
+ *retval = indx;
-int
-stat_extended(__unused proc_t p, struct stat_extended_args *uap, __unused register_t *retval)
-{
- return (stat1(uap->path, uap->ub, uap->xsecurity, uap->xsecurity_size, 0));
-}
+ return 0;
+bad:
+ context = *vfs_context_current();
+ context.vc_ucred = fp->fp_glob->fg_cred;
+
+ if ((fp->fp_glob->fg_flag & FWASLOCKED) &&
+ (FILEGLOB_DTYPE(fp->fp_glob) == DTYPE_VNODE)) {
+ struct flock lf = {
+ .l_whence = SEEK_SET,
+ .l_type = F_UNLCK,
+ };
-/*
- * Returns: 0 Success
- * stat1:??? [see stat1() in this file]
- */
-int
-stat(__unused proc_t p, struct stat_args *uap, __unused register_t *retval)
-{
- return(stat1(uap->path, uap->ub, 0, 0, 0));
-}
+ (void)VNOP_ADVLOCK(
+ vp, (caddr_t)fp->fp_glob, F_UNLCK, &lf, F_FLOCK, ctx, NULL);
+ }
-int
-stat64(__unused proc_t p, struct stat64_args *uap, __unused register_t *retval)
-{
- return(stat1(uap->path, uap->ub, 0, 0, 1));
-}
+ vn_close(vp, fp->fp_glob->fg_flag, &context);
+ vnode_put(vp);
+ fp_free(p, indx, fp);
-int
-stat64_extended(__unused proc_t p, struct stat64_extended_args *uap, __unused register_t *retval)
-{
- return (stat1(uap->path, uap->ub, uap->xsecurity, uap->xsecurity_size, 1));
+ return error;
}
+
/*
- * Get file status; this version does not follow links.
+ * While most of the *at syscall handlers can call nameiat() which
+ * is a wrapper around namei, the use of namei and initialisation
+ * of nameidata are far removed and in different functions - namei
+ * gets called in vn_open_auth for open1. So we'll just do here what
+ * nameiat() does.
*/
static int
-lstat1(user_addr_t path, user_addr_t ub, user_addr_t xsecurity, user_addr_t xsecurity_size, int isstat64)
+open1at(vfs_context_t ctx, struct nameidata *ndp, int uflags,
+ struct vnode_attr *vap, fp_allocfn_t fp_zalloc, void *cra, int32_t *retval,
+ int dirfd)
{
- struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
+ if ((dirfd != AT_FDCWD) && !(ndp->ni_cnd.cn_flags & USEDVP)) {
+ int error;
+ char c;
- NDINIT(&nd, LOOKUP, NOTRIGGER | NOFOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, path, ctx);
+ if (UIO_SEG_IS_USER_SPACE(ndp->ni_segflg)) {
+ error = copyin(ndp->ni_dirp, &c, sizeof(char));
+ if (error) {
+ return error;
+ }
+ } else {
+ c = *((char *)(ndp->ni_dirp));
+ }
- return(stat2(ctx, &nd, ub, xsecurity, xsecurity_size, isstat64));
-}
+ if (c != '/') {
+ vnode_t dvp_at;
-int
-lstat_extended(__unused proc_t p, struct lstat_extended_args *uap, __unused register_t *retval)
-{
- return (lstat1(uap->path, uap->ub, uap->xsecurity, uap->xsecurity_size, 0));
-}
+ error = vnode_getfromfd(ndp->ni_cnd.cn_context, dirfd,
+ &dvp_at);
+ if (error) {
+ return error;
+ }
-int
-lstat(__unused proc_t p, struct lstat_args *uap, __unused register_t *retval)
-{
- return(lstat1(uap->path, uap->ub, 0, 0, 0));
-}
-int
-lstat64(__unused proc_t p, struct lstat64_args *uap, __unused register_t *retval)
-{
- return(lstat1(uap->path, uap->ub, 0, 0, 1));
-}
+ if (vnode_vtype(dvp_at) != VDIR) {
+ vnode_put(dvp_at);
+ return ENOTDIR;
+ }
-int
-lstat64_extended(__unused proc_t p, struct lstat64_extended_args *uap, __unused register_t *retval)
-{
- return (lstat1(uap->path, uap->ub, uap->xsecurity, uap->xsecurity_size, 1));
+ ndp->ni_dvp = dvp_at;
+ ndp->ni_cnd.cn_flags |= USEDVP;
+ error = open1(ctx, ndp, uflags, vap, fp_zalloc, cra,
+ retval);
+ vnode_put(dvp_at);
+ return error;
+ }
+ }
+
+ return open1(ctx, ndp, uflags, vap, fp_zalloc, cra, retval);
}
/*
- * Get configurable pathname variables.
+ * open_extended: open a file given a path name; with extended argument list (including extended security (ACL)).
+ *
+ * Parameters: p Process requesting the open
+ * uap User argument descriptor (see below)
+ * retval Pointer to an area to receive the
+ * return calue from the system call
+ *
+ * Indirect: uap->path Path to open (same as 'open')
+ * uap->flags Flags to open (same as 'open'
+ * uap->uid UID to set, if creating
+ * uap->gid GID to set, if creating
+ * uap->mode File mode, if creating (same as 'open')
+ * uap->xsecurity ACL to set, if creating
*
* Returns: 0 Success
- * namei:???
- * vn_pathconf:???
+ * !0 errno value
*
- * Notes: Global implementation constants are intended to be
- * implemented in this function directly; all other constants
- * are per-FS implementation, and therefore must be handled in
- * each respective FS, instead.
+ * Notes: The kauth_filesec_t in 'va', if any, is in host byte order.
*
- * XXX We implement some things globally right now that should actually be
- * XXX per-FS; we will need to deal with this at some point.
+ * XXX: We should enummerate the possible errno values here, and where
+ * in the code they originated.
*/
-/* ARGSUSED */
int
-pathconf(__unused proc_t p, struct pathconf_args *uap, register_t *retval)
+open_extended(proc_t p, struct open_extended_args *uap, int32_t *retval)
{
- int error;
- struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
-
- NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- error = namei(&nd);
- if (error)
- return (error);
-
- error = vn_pathconf(nd.ni_vp, uap->name, retval, ctx);
+ struct filedesc *fdp = p->p_fd;
+ int ciferror;
+ kauth_filesec_t xsecdst;
+ struct vnode_attr va;
+ struct nameidata nd;
+ int cmode;
- vnode_put(nd.ni_vp);
- nameidone(&nd);
- return (error);
-}
+ AUDIT_ARG(owner, uap->uid, uap->gid);
-/*
- * Return target name of a symbolic link.
- */
-/* ARGSUSED */
-int
-readlink(proc_t p, struct readlink_args *uap, register_t *retval)
-{
- vnode_t vp;
- uio_t auio;
- int spacetype = proc_is64bit(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
- int error;
- struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
- char uio_buf[ UIO_SIZEOF(1) ];
+ xsecdst = NULL;
+ if ((uap->xsecurity != USER_ADDR_NULL) &&
+ ((ciferror = kauth_copyinfilesec(uap->xsecurity, &xsecdst)) != 0)) {
+ return ciferror;
+ }
- NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- error = namei(&nd);
- if (error)
- return (error);
- vp = nd.ni_vp;
+ VATTR_INIT(&va);
+ cmode = ((uap->mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT;
+ VATTR_SET(&va, va_mode, cmode & ACCESSPERMS);
+ if (uap->uid != KAUTH_UID_NONE) {
+ VATTR_SET(&va, va_uid, uap->uid);
+ }
+ if (uap->gid != KAUTH_GID_NONE) {
+ VATTR_SET(&va, va_gid, uap->gid);
+ }
+ if (xsecdst != NULL) {
+ VATTR_SET(&va, va_acl, &xsecdst->fsec_acl);
+ }
- nameidone(&nd);
+ NDINIT(&nd, LOOKUP, OP_OPEN, FOLLOW | AUDITVNPATH1, UIO_USERSPACE,
+ uap->path, vfs_context_current());
- auio = uio_createwithbuffer(1, 0, spacetype, UIO_READ,
- &uio_buf[0], sizeof(uio_buf));
- uio_addiov(auio, uap->buf, uap->count);
- if (vp->v_type != VLNK)
- error = EINVAL;
- else {
-#if CONFIG_MACF
- error = mac_vnode_check_readlink(ctx,
- vp);
-#endif
- if (error == 0)
- error = vnode_authorize(vp, NULL, KAUTH_VNODE_READ_DATA, ctx);
- if (error == 0)
- error = VNOP_READLINK(vp, auio, ctx);
+ ciferror = open1(vfs_context_current(), &nd, uap->flags, &va,
+ fileproc_alloc_init, NULL, retval);
+ if (xsecdst != NULL) {
+ kauth_filesec_free(xsecdst);
}
- vnode_put(vp);
- // LP64todo - fix this
- *retval = uap->count - (int)uio_resid(auio);
- return (error);
+
+ return ciferror;
}
/*
- * Change file flags.
+ * Go through the data-protected atomically controlled open (2)
+ *
+ * int open_dprotected_np(user_addr_t path, int flags, int class, int dpflags, int mode)
*/
-static int
-chflags1(vnode_t vp, int flags, vfs_context_t ctx)
+int
+open_dprotected_np(__unused proc_t p, struct open_dprotected_np_args *uap, int32_t *retval)
{
+ int flags = uap->flags;
+ int class = uap->class;
+ int dpflags = uap->dpflags;
+
+ /*
+ * Follow the same path as normal open(2)
+ * Look up the item if it exists, and acquire the vnode.
+ */
+ struct filedesc *fdp = p->p_fd;
struct vnode_attr va;
- kauth_action_t action;
+ struct nameidata nd;
+ int cmode;
int error;
VATTR_INIT(&va);
- VATTR_SET(&va, va_flags, flags);
+ /* Mask off all but regular access permissions */
+ cmode = ((uap->mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT;
+ VATTR_SET(&va, va_mode, cmode & ACCESSPERMS);
-#if CONFIG_MACF
- error = mac_vnode_check_setflags(ctx, vp, flags);
- if (error)
- goto out;
-#endif
+ NDINIT(&nd, LOOKUP, OP_OPEN, FOLLOW | AUDITVNPATH1, UIO_USERSPACE,
+ uap->path, vfs_context_current());
- /* request authorisation, disregard immutability */
- if ((error = vnode_authattr(vp, &va, &action, ctx)) != 0)
- goto out;
/*
- * Request that the auth layer disregard those file flags it's allowed to when
- * authorizing this operation; we need to do this in order to be able to
- * clear immutable flags.
+ * Initialize the extra fields in vnode_attr to pass down our
+ * extra fields.
+ * 1. target cprotect class.
+ * 2. set a flag to mark it as requiring open-raw-encrypted semantics.
*/
- if (action && ((error = vnode_authorize(vp, NULL, action | KAUTH_VNODE_NOIMMUTABLE, ctx)) != 0))
- goto out;
- error = vnode_setattr(vp, &va, ctx);
-
- if ((error == 0) && !VATTR_IS_SUPPORTED(&va, va_flags)) {
- error = ENOTSUP;
+ if (flags & O_CREAT) {
+ /* lower level kernel code validates that the class is valid before applying it. */
+ if (class != PROTECTION_CLASS_DEFAULT) {
+ /*
+ * PROTECTION_CLASS_DEFAULT implies that we make the class for this
+ * file behave the same as open (2)
+ */
+ VATTR_SET(&va, va_dataprotect_class, class);
+ }
}
-out:
- vnode_put(vp);
- return(error);
-}
-
-/*
- * Change flags of a file given a path name.
- */
-/* ARGSUSED */
-int
-chflags(__unused proc_t p, struct chflags_args *uap, __unused register_t *retval)
-{
- vnode_t vp;
- vfs_context_t ctx = vfs_context_current();
- int error;
- struct nameidata nd;
- AUDIT_ARG(fflags, uap->flags);
- NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- error = namei(&nd);
- if (error)
- return (error);
- vp = nd.ni_vp;
- nameidone(&nd);
+ if (dpflags & (O_DP_GETRAWENCRYPTED | O_DP_GETRAWUNENCRYPTED)) {
+ if (flags & (O_RDWR | O_WRONLY)) {
+ /* Not allowed to write raw encrypted bytes */
+ return EINVAL;
+ }
+ if (uap->dpflags & O_DP_GETRAWENCRYPTED) {
+ VATTR_SET(&va, va_dataprotect_flags, VA_DP_RAWENCRYPTED);
+ }
+ if (uap->dpflags & O_DP_GETRAWUNENCRYPTED) {
+ VATTR_SET(&va, va_dataprotect_flags, VA_DP_RAWUNENCRYPTED);
+ }
+ }
- error = chflags1(vp, uap->flags, ctx);
+ error = open1(vfs_context_current(), &nd, uap->flags, &va,
+ fileproc_alloc_init, NULL, retval);
- return(error);
+ return error;
}
-/*
- * Change flags of a file given a file descriptor.
- */
-/* ARGSUSED */
-int
-fchflags(__unused proc_t p, struct fchflags_args *uap, __unused register_t *retval)
+static int
+openat_internal(vfs_context_t ctx, user_addr_t path, int flags, int mode,
+ int fd, enum uio_seg segflg, int *retval)
{
- vnode_t vp;
+ struct filedesc *fdp = (vfs_context_proc(ctx))->p_fd;
+ struct {
+ struct vnode_attr va;
+ struct nameidata nd;
+ } *__open_data;
+ struct vnode_attr *vap;
+ struct nameidata *ndp;
+ int cmode;
int error;
- AUDIT_ARG(fd, uap->fd);
- AUDIT_ARG(fflags, uap->flags);
- if ( (error = file_vnode(uap->fd, &vp)) )
- return (error);
+ __open_data = kheap_alloc(KHEAP_TEMP, sizeof(*__open_data), Z_WAITOK);
+ vap = &__open_data->va;
+ ndp = &__open_data->nd;
- if ((error = vnode_getwithref(vp))) {
- file_drop(uap->fd);
- return(error);
- }
+ VATTR_INIT(vap);
+ /* Mask off all but regular access permissions */
+ cmode = ((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT;
+ VATTR_SET(vap, va_mode, cmode & ACCESSPERMS);
- AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+ NDINIT(ndp, LOOKUP, OP_OPEN, FOLLOW | AUDITVNPATH1,
+ segflg, path, ctx);
- error = chflags1(vp, uap->flags, vfs_context_current());
+ error = open1at(ctx, ndp, flags, vap, fileproc_alloc_init, NULL,
+ retval, fd);
- file_drop(uap->fd);
- return (error);
+ kheap_free(KHEAP_TEMP, __open_data, sizeof(*__open_data));
+
+ return error;
}
-/*
- * Change security information on a filesystem object.
- *
- * Returns: 0 Success
- * EPERM Operation not permitted
- * vnode_authattr:??? [anything vnode_authattr can return]
- * vnode_authorize:??? [anything vnode_authorize can return]
- * vnode_setattr:??? [anything vnode_setattr can return]
- *
- * Notes: If vnode_authattr or vnode_authorize return EACCES, it will be
- * translated to EPERM before being returned.
- */
-static int
-chmod2(vfs_context_t ctx, vnode_t vp, struct vnode_attr *vap)
+int
+open(proc_t p, struct open_args *uap, int32_t *retval)
{
- kauth_action_t action;
- int error;
-
- AUDIT_ARG(mode, (mode_t)vap->va_mode);
-#warning XXX audit new args
-
-#if NAMEDSTREAMS
- /* chmod calls are not allowed for resource forks. */
- if (vp->v_flag & VISNAMEDSTREAM) {
- return (EPERM);
- }
-#endif
-
-#if CONFIG_MACF
- error = mac_vnode_check_setmode(ctx, vp, (mode_t)vap->va_mode);
- if (error)
- return (error);
-#endif
-
- /* make sure that the caller is allowed to set this security information */
- if (((error = vnode_authattr(vp, vap, &action, ctx)) != 0) ||
- ((error = vnode_authorize(vp, NULL, action, ctx)) != 0)) {
- if (error == EACCES)
- error = EPERM;
- return(error);
- }
-
- error = vnode_setattr(vp, vap, ctx);
-
- return (error);
+ __pthread_testcancel(1);
+ return open_nocancel(p, (struct open_nocancel_args *)uap, retval);
}
+int
+open_nocancel(__unused proc_t p, struct open_nocancel_args *uap,
+ int32_t *retval)
+{
+ return openat_internal(vfs_context_current(), uap->path, uap->flags,
+ uap->mode, AT_FDCWD, UIO_USERSPACE, retval);
+}
-/*
- * Change mode of a file given path name.
- *
- * Returns: 0 Success
- * namei:??? [anything namei can return]
- * chmod2:??? [anything chmod2 can return]
- */
-static int
-chmod1(vfs_context_t ctx, user_addr_t path, struct vnode_attr *vap)
+int
+openat_nocancel(__unused proc_t p, struct openat_nocancel_args *uap,
+ int32_t *retval)
{
- struct nameidata nd;
- int error;
+ return openat_internal(vfs_context_current(), uap->path, uap->flags,
+ uap->mode, uap->fd, UIO_USERSPACE, retval);
+}
- NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, path, ctx);
- if ((error = namei(&nd)))
- return (error);
- error = chmod2(ctx, nd.ni_vp, vap);
- vnode_put(nd.ni_vp);
- nameidone(&nd);
- return(error);
+int
+openat(proc_t p, struct openat_args *uap, int32_t *retval)
+{
+ __pthread_testcancel(1);
+ return openat_nocancel(p, (struct openat_nocancel_args *)uap, retval);
}
/*
- * A chmod system call using an extended argument list compared to the regular
- * system call 'mkfifo'.
+ * openbyid_np: open a file given a file system id and a file system object id
+ * the hfs file system object id is an fsobj_id_t {uint32, uint32}
+ * file systems that don't support object ids it is a node id (uint64_t).
*
* Parameters: p Process requesting the open
* uap User argument descriptor (see below)
- * retval (ignored)
+ * retval Pointer to an area to receive the
+ * return calue from the system call
*
- * Indirect: uap->path Path to object (same as 'chmod')
- * uap->uid UID to set
- * uap->gid GID to set
- * uap->mode File mode to set (same as 'chmod')
- * uap->xsecurity ACL to set (or delete)
+ * Indirect: uap->path Path to open (same as 'open')
+ *
+ * uap->fsid id of target file system
+ * uap->objid id of target file system object
+ * uap->flags Flags to open (same as 'open')
*
* Returns: 0 Success
* !0 errno value
*
- * Notes: The kauth_filesec_t in 'va', if any, is in host byte order.
*
* XXX: We should enummerate the possible errno values here, and where
* in the code they originated.
*/
int
-chmod_extended(__unused proc_t p, struct chmod_extended_args *uap, __unused register_t *retval)
+openbyid_np(__unused proc_t p, struct openbyid_np_args *uap, int *retval)
{
+ fsid_t fsid;
+ uint64_t objid;
int error;
- struct vnode_attr va;
- kauth_filesec_t xsecdst;
+ char *buf = NULL;
+ int buflen = MAXPATHLEN;
+ int pathlen = 0;
+ vfs_context_t ctx = vfs_context_current();
- VATTR_INIT(&va);
- if (uap->mode != -1)
- VATTR_SET(&va, va_mode, uap->mode & ALLPERMS);
- if (uap->uid != KAUTH_UID_NONE)
- VATTR_SET(&va, va_uid, uap->uid);
- if (uap->gid != KAUTH_GID_NONE)
- VATTR_SET(&va, va_gid, uap->gid);
+ if ((error = priv_check_cred(vfs_context_ucred(ctx), PRIV_VFS_OPEN_BY_ID, 0))) {
+ return error;
+ }
- xsecdst = NULL;
- switch(uap->xsecurity) {
- /* explicit remove request */
- case CAST_USER_ADDR_T((void *)1): /* _FILESEC_REMOVE_ACL */
- VATTR_SET(&va, va_acl, NULL);
- break;
- /* not being set */
- case USER_ADDR_NULL:
- break;
- default:
- if ((error = kauth_copyinfilesec(uap->xsecurity, &xsecdst)) != 0)
- return(error);
- VATTR_SET(&va, va_acl, &xsecdst->fsec_acl);
- KAUTH_DEBUG("CHMOD - setting ACL with %d entries", va.va_acl->acl_entrycount);
+ if ((error = copyin(uap->fsid, (caddr_t)&fsid, sizeof(fsid)))) {
+ return error;
}
- error = chmod1(vfs_context_current(), uap->path, &va);
+ /*uap->obj is an fsobj_id_t defined as struct {uint32_t, uint32_t} */
+ if ((error = copyin(uap->objid, (caddr_t)&objid, sizeof(uint64_t)))) {
+ return error;
+ }
- if (xsecdst != NULL)
- kauth_filesec_free(xsecdst);
- return(error);
-}
+ AUDIT_ARG(value32, fsid.val[0]);
+ AUDIT_ARG(value64, objid);
-/*
- * Returns: 0 Success
- * chmod1:??? [anything chmod1 can return]
- */
-int
-chmod(__unused proc_t p, struct chmod_args *uap, __unused register_t *retval)
-{
- struct vnode_attr va;
+ /*resolve path from fsis, objid*/
+ do {
+ buf = kheap_alloc(KHEAP_TEMP, buflen + 1, Z_WAITOK);
+ if (buf == NULL) {
+ return ENOMEM;
+ }
- VATTR_INIT(&va);
- VATTR_SET(&va, va_mode, uap->mode & ALLPERMS);
+ error = fsgetpath_internal( ctx, fsid.val[0], objid, buflen,
+ buf, FSOPT_ISREALFSID, &pathlen);
- return(chmod1(vfs_context_current(), uap->path, &va));
-}
+ if (error) {
+ kheap_free(KHEAP_TEMP, buf, buflen + 1);
+ buf = NULL;
+ }
+ } while (error == ENOSPC && (buflen += MAXPATHLEN));
-/*
- * Change mode of a file given a file descriptor.
- */
-static int
-fchmod1(__unused proc_t p, int fd, struct vnode_attr *vap)
-{
- vnode_t vp;
- int error;
+ if (error) {
+ return error;
+ }
- AUDIT_ARG(fd, fd);
+ buf[pathlen] = 0;
- if ((error = file_vnode(fd, &vp)) != 0)
- return (error);
- if ((error = vnode_getwithref(vp)) != 0) {
- file_drop(fd);
- return(error);
- }
- AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+ error = openat_internal(
+ ctx, (user_addr_t)buf, uap->oflags, 0, AT_FDCWD, UIO_SYSSPACE, retval);
- error = chmod2(vfs_context_current(), vp, vap);
- (void)vnode_put(vp);
- file_drop(fd);
+ kheap_free(KHEAP_TEMP, buf, buflen + 1);
- return (error);
+ return error;
}
+
+/*
+ * Create a special file.
+ */
+static int mkfifo1(vfs_context_t ctx, user_addr_t upath, struct vnode_attr *vap);
+
int
-fchmod_extended(proc_t p, struct fchmod_extended_args *uap, __unused register_t *retval)
+mknod(proc_t p, struct mknod_args *uap, __unused int32_t *retval)
{
- int error;
struct vnode_attr va;
- kauth_filesec_t xsecdst;
+ vfs_context_t ctx = vfs_context_current();
+ int error;
+ struct nameidata nd;
+ vnode_t vp, dvp;
VATTR_INIT(&va);
- if (uap->mode != -1)
- VATTR_SET(&va, va_mode, uap->mode & ALLPERMS);
- if (uap->uid != KAUTH_UID_NONE)
- VATTR_SET(&va, va_uid, uap->uid);
- if (uap->gid != KAUTH_GID_NONE)
- VATTR_SET(&va, va_gid, uap->gid);
+ VATTR_SET(&va, va_mode, (uap->mode & ALLPERMS) & ~p->p_fd->fd_cmask);
+ VATTR_SET(&va, va_rdev, uap->dev);
- xsecdst = NULL;
- switch(uap->xsecurity) {
- case USER_ADDR_NULL:
- VATTR_SET(&va, va_acl, NULL);
- break;
- case CAST_USER_ADDR_T(-1):
- break;
- default:
- if ((error = kauth_copyinfilesec(uap->xsecurity, &xsecdst)) != 0)
- return(error);
- VATTR_SET(&va, va_acl, &xsecdst->fsec_acl);
+ /* If it's a mknod() of a FIFO, call mkfifo1() instead */
+ if ((uap->mode & S_IFMT) == S_IFIFO) {
+ return mkfifo1(ctx, uap->path, &va);
}
- error = fchmod1(p, uap->fd, &va);
+ AUDIT_ARG(mode, (mode_t)uap->mode);
+ AUDIT_ARG(value32, uap->dev);
-
- switch(uap->xsecurity) {
- case USER_ADDR_NULL:
- case CAST_USER_ADDR_T(-1):
+ if ((error = suser(vfs_context_ucred(ctx), &p->p_acflag))) {
+ return error;
+ }
+ NDINIT(&nd, CREATE, OP_MKNOD, LOCKPARENT | AUDITVNPATH1,
+ UIO_USERSPACE, uap->path, ctx);
+ error = namei(&nd);
+ if (error) {
+ return error;
+ }
+ dvp = nd.ni_dvp;
+ vp = nd.ni_vp;
+
+ if (vp != NULL) {
+ error = EEXIST;
+ goto out;
+ }
+
+ switch (uap->mode & S_IFMT) {
+ case S_IFCHR:
+ VATTR_SET(&va, va_type, VCHR);
+ break;
+ case S_IFBLK:
+ VATTR_SET(&va, va_type, VBLK);
break;
default:
- if (xsecdst != NULL)
- kauth_filesec_free(xsecdst);
+ error = EINVAL;
+ goto out;
}
- return(error);
-}
-int
-fchmod(proc_t p, struct fchmod_args *uap, __unused register_t *retval)
-{
- struct vnode_attr va;
+#if CONFIG_MACF
+ error = mac_vnode_check_create(ctx,
+ nd.ni_dvp, &nd.ni_cnd, &va);
+ if (error) {
+ goto out;
+ }
+#endif
- VATTR_INIT(&va);
- VATTR_SET(&va, va_mode, uap->mode & ALLPERMS);
+ if ((error = vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_FILE, ctx)) != 0) {
+ goto out;
+ }
- return(fchmod1(p, uap->fd, &va));
-}
+ if ((error = vn_create(dvp, &vp, &nd, &va, 0, 0, NULL, ctx)) != 0) {
+ goto out;
+ }
+
+ if (vp) {
+ int update_flags = 0;
+
+ // Make sure the name & parent pointers are hooked up
+ if (vp->v_name == NULL) {
+ update_flags |= VNODE_UPDATE_NAME;
+ }
+ if (vp->v_parent == NULLVP) {
+ update_flags |= VNODE_UPDATE_PARENT;
+ }
+
+ if (update_flags) {
+ vnode_update_identity(vp, dvp, nd.ni_cnd.cn_nameptr, nd.ni_cnd.cn_namelen, nd.ni_cnd.cn_hash, update_flags);
+ }
+
+#if CONFIG_FSE
+ add_fsevent(FSE_CREATE_FILE, ctx,
+ FSE_ARG_VNODE, vp,
+ FSE_ARG_DONE);
+#endif
+ }
+
+out:
+ /*
+ * nameidone has to happen before we vnode_put(dvp)
+ * since it may need to release the fs_nodelock on the dvp
+ */
+ nameidone(&nd);
+
+ if (vp) {
+ vnode_put(vp);
+ }
+ vnode_put(dvp);
+ return error;
+}
/*
- * Set ownership given a path name.
+ * Create a named pipe.
+ *
+ * Returns: 0 Success
+ * EEXIST
+ * namei:???
+ * vnode_authorize:???
+ * vn_create:???
*/
-/* ARGSUSED */
static int
-chown1(vfs_context_t ctx, struct chown_args *uap, __unused register_t *retval, int follow)
+mkfifo1(vfs_context_t ctx, user_addr_t upath, struct vnode_attr *vap)
{
- vnode_t vp;
- struct vnode_attr va;
+ vnode_t vp, dvp;
int error;
struct nameidata nd;
- kauth_action_t action;
-
- AUDIT_ARG(owner, uap->uid, uap->gid);
- NDINIT(&nd, LOOKUP, (follow ? FOLLOW : 0) | NOTRIGGER | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
+ NDINIT(&nd, CREATE, OP_MKFIFO, LOCKPARENT | AUDITVNPATH1,
+ UIO_USERSPACE, upath, ctx);
error = namei(&nd);
- if (error)
- return (error);
+ if (error) {
+ return error;
+ }
+ dvp = nd.ni_dvp;
vp = nd.ni_vp;
- nameidone(&nd);
-
- VATTR_INIT(&va);
- if (uap->uid != VNOVAL)
- VATTR_SET(&va, va_uid, uap->uid);
- if (uap->gid != VNOVAL)
- VATTR_SET(&va, va_gid, uap->gid);
-
-#if CONFIG_MACF
- error = mac_vnode_check_setowner(ctx, vp, uap->uid, uap->gid);
- if (error)
+ /* check that this is a new file and authorize addition */
+ if (vp != NULL) {
+ error = EEXIST;
goto out;
-#endif
+ }
+ VATTR_SET(vap, va_type, VFIFO);
- /* preflight and authorize attribute changes */
- if ((error = vnode_authattr(vp, &va, &action, ctx)) != 0)
- goto out;
- if (action && ((error = vnode_authorize(vp, NULL, action, ctx)) != 0))
+ if ((error = vn_authorize_create(dvp, &nd.ni_cnd, vap, ctx, NULL)) != 0) {
goto out;
- error = vnode_setattr(vp, &va, ctx);
-
+ }
+
+ error = vn_create(dvp, &vp, &nd, vap, 0, 0, NULL, ctx);
out:
/*
- * EACCES is only allowed from namei(); permissions failure should
- * return EPERM, so we need to translate the error code.
+ * nameidone has to happen before we vnode_put(dvp)
+ * since it may need to release the fs_nodelock on the dvp
*/
- if (error == EACCES)
- error = EPERM;
-
- vnode_put(vp);
- return (error);
-}
+ nameidone(&nd);
-int
-chown(__unused proc_t p, struct chown_args *uap, register_t *retval)
-{
- return chown1(vfs_context_current(), uap, retval, 1);
-}
+ if (vp) {
+ vnode_put(vp);
+ }
+ vnode_put(dvp);
-int
-lchown(__unused proc_t p, struct lchown_args *uap, register_t *retval)
-{
- /* Argument list identical, but machine generated; cast for chown1() */
- return chown1(vfs_context_current(), (struct chown_args *)uap, retval, 0);
+ return error;
}
+
/*
- * Set ownership given a file descriptor.
+ * mkfifo_extended: Create a named pipe; with extended argument list (including extended security (ACL)).
+ *
+ * Parameters: p Process requesting the open
+ * uap User argument descriptor (see below)
+ * retval (Ignored)
+ *
+ * Indirect: uap->path Path to fifo (same as 'mkfifo')
+ * uap->uid UID to set
+ * uap->gid GID to set
+ * uap->mode File mode to set (same as 'mkfifo')
+ * uap->xsecurity ACL to set, if creating
+ *
+ * Returns: 0 Success
+ * !0 errno value
+ *
+ * Notes: The kauth_filesec_t in 'va', if any, is in host byte order.
+ *
+ * XXX: We should enummerate the possible errno values here, and where
+ * in the code they originated.
*/
-/* ARGSUSED */
int
-fchown(__unused proc_t p, struct fchown_args *uap, __unused register_t *retval)
+mkfifo_extended(proc_t p, struct mkfifo_extended_args *uap, __unused int32_t *retval)
{
+ int ciferror;
+ kauth_filesec_t xsecdst;
struct vnode_attr va;
- vfs_context_t ctx = vfs_context_current();
- vnode_t vp;
- int error;
- kauth_action_t action;
AUDIT_ARG(owner, uap->uid, uap->gid);
- AUDIT_ARG(fd, uap->fd);
-
- if ( (error = file_vnode(uap->fd, &vp)) )
- return (error);
- if ( (error = vnode_getwithref(vp)) ) {
- file_drop(uap->fd);
- return(error);
+ xsecdst = KAUTH_FILESEC_NONE;
+ if (uap->xsecurity != USER_ADDR_NULL) {
+ if ((ciferror = kauth_copyinfilesec(uap->xsecurity, &xsecdst)) != 0) {
+ return ciferror;
+ }
}
- AUDIT_ARG(vnpath, vp, ARG_VNODE1);
VATTR_INIT(&va);
- if (uap->uid != VNOVAL)
+ VATTR_SET(&va, va_mode, (uap->mode & ALLPERMS) & ~p->p_fd->fd_cmask);
+ if (uap->uid != KAUTH_UID_NONE) {
VATTR_SET(&va, va_uid, uap->uid);
- if (uap->gid != VNOVAL)
+ }
+ if (uap->gid != KAUTH_GID_NONE) {
VATTR_SET(&va, va_gid, uap->gid);
-
-#if NAMEDSTREAMS
- /* chown calls are not allowed for resource forks. */
- if (vp->v_flag & VISNAMEDSTREAM) {
- error = EPERM;
- goto out;
}
-#endif
+ if (xsecdst != KAUTH_FILESEC_NONE) {
+ VATTR_SET(&va, va_acl, &xsecdst->fsec_acl);
+ }
-#if CONFIG_MACF
- error = mac_vnode_check_setowner(ctx, vp, uap->uid, uap->gid);
- if (error)
- goto out;
-#endif
+ ciferror = mkfifo1(vfs_context_current(), uap->path, &va);
- /* preflight and authorize attribute changes */
- if ((error = vnode_authattr(vp, &va, &action, ctx)) != 0)
- goto out;
- if (action && ((error = vnode_authorize(vp, NULL, action, ctx)) != 0)) {
- if (error == EACCES)
- error = EPERM;
- goto out;
+ if (xsecdst != KAUTH_FILESEC_NONE) {
+ kauth_filesec_free(xsecdst);
}
- error = vnode_setattr(vp, &va, ctx);
-
-out:
- (void)vnode_put(vp);
- file_drop(uap->fd);
- return (error);
+ return ciferror;
}
-static int
-getutimes(user_addr_t usrtvp, struct timespec *tsp)
+/* ARGSUSED */
+int
+mkfifo(proc_t p, struct mkfifo_args *uap, __unused int32_t *retval)
{
- struct user_timeval tv[2];
- int error;
+ struct vnode_attr va;
- if (usrtvp == USER_ADDR_NULL) {
- struct timeval old_tv;
- /* XXX Y2038 bug because of microtime argument */
- microtime(&old_tv);
- TIMEVAL_TO_TIMESPEC(&old_tv, &tsp[0]);
- tsp[1] = tsp[0];
- } else {
- if (IS_64BIT_PROCESS(current_proc())) {
- error = copyin(usrtvp, (void *)tv, sizeof(tv));
- } else {
- struct timeval old_tv[2];
- error = copyin(usrtvp, (void *)old_tv, sizeof(old_tv));
- tv[0].tv_sec = old_tv[0].tv_sec;
- tv[0].tv_usec = old_tv[0].tv_usec;
- tv[1].tv_sec = old_tv[1].tv_sec;
- tv[1].tv_usec = old_tv[1].tv_usec;
- }
- if (error)
- return (error);
- TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]);
- TIMEVAL_TO_TIMESPEC(&tv[1], &tsp[1]);
- }
- return 0;
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_mode, (uap->mode & ALLPERMS) & ~p->p_fd->fd_cmask);
+
+ return mkfifo1(vfs_context_current(), uap->path, &va);
}
-static int
-setutimes(vfs_context_t ctx, vnode_t vp, const struct timespec *ts,
- int nullflag)
+extern int safe_getpath_new(struct vnode *dvp, char *leafname, char *path, int _len, int *truncated_path, int firmlink);
+extern int safe_getpath(struct vnode *dvp, char *leafname, char *path, int _len, int *truncated_path);
+extern int safe_getpath_no_firmlink(struct vnode *dvp, char *leafname, char *path, int _len, int *truncated_path);
+
+int
+safe_getpath_new(struct vnode *dvp, char *leafname, char *path, int _len, int *truncated_path, int firmlink)
{
- int error;
- struct vnode_attr va;
- kauth_action_t action;
+ int ret, len = _len;
- AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+ *truncated_path = 0;
- VATTR_INIT(&va);
- VATTR_SET(&va, va_access_time, ts[0]);
- VATTR_SET(&va, va_modify_time, ts[1]);
- if (nullflag)
- va.va_vaflags |= VA_UTIMES_NULL;
+ if (firmlink) {
+ ret = vn_getpath(dvp, path, &len);
+ } else {
+ ret = vn_getpath_no_firmlink(dvp, path, &len);
+ }
+ if (ret == 0 && len < (MAXPATHLEN - 1)) {
+ if (leafname) {
+ path[len - 1] = '/';
+ len += strlcpy(&path[len], leafname, MAXPATHLEN - len) + 1;
+ if (len > MAXPATHLEN) {
+ char *ptr;
+
+ // the string got truncated!
+ *truncated_path = 1;
+ ptr = strrchr(path, '/');
+ if (ptr) {
+ *ptr = '\0'; // chop off the string at the last directory component
+ }
+ len = (int)strlen(path) + 1;
+ }
+ }
+ } else if (ret == 0) {
+ *truncated_path = 1;
+ } else if (ret != 0) {
+ struct vnode *mydvp = dvp;
+
+ if (ret != ENOSPC) {
+ printf("safe_getpath: failed to get the path for vp %p (%s) : err %d\n",
+ dvp, dvp->v_name ? dvp->v_name : "no-name", ret);
+ }
+ *truncated_path = 1;
+
+ do {
+ if (mydvp->v_parent != NULL) {
+ mydvp = mydvp->v_parent;
+ } else if (mydvp->v_mount) {
+ strlcpy(path, mydvp->v_mount->mnt_vfsstat.f_mntonname, _len);
+ break;
+ } else {
+ // no parent and no mount point? only thing is to punt and say "/" changed
+ strlcpy(path, "/", _len);
+ len = 2;
+ mydvp = NULL;
+ }
-#if NAMEDSTREAMS
- /* utimes calls are not allowed for resource forks. */
- if (vp->v_flag & VISNAMEDSTREAM) {
- error = EPERM;
- goto out;
- }
-#endif
+ if (mydvp == NULL) {
+ break;
+ }
-#if CONFIG_MACF
- error = mac_vnode_check_setutimes(ctx, vp, ts[0], ts[1]);
- if (error)
- goto out;
-#endif
- if ((error = vnode_authattr(vp, &va, &action, ctx)) != 0) {
- if (!nullflag && error == EACCES)
- error = EPERM;
- goto out;
+ len = _len;
+ if (firmlink) {
+ ret = vn_getpath(mydvp, path, &len);
+ } else {
+ ret = vn_getpath_no_firmlink(mydvp, path, &len);
+ }
+ } while (ret == ENOSPC);
}
- /* since we may not need to auth anything, check here */
- if ((action != 0) && ((error = vnode_authorize(vp, NULL, action, ctx)) != 0)) {
- if (!nullflag && error == EACCES)
- error = EPERM;
- goto out;
- }
- error = vnode_setattr(vp, &va, ctx);
+ return len;
+}
-out:
- return error;
+int
+safe_getpath(struct vnode *dvp, char *leafname, char *path, int _len, int *truncated_path)
+{
+ return safe_getpath_new(dvp, leafname, path, _len, truncated_path, 1);
}
-/*
- * Set the access and modification times of a file.
- */
-/* ARGSUSED */
int
-utimes(__unused proc_t p, struct utimes_args *uap, __unused register_t *retval)
+safe_getpath_no_firmlink(struct vnode *dvp, char *leafname, char *path, int _len, int *truncated_path)
{
- struct timespec ts[2];
- user_addr_t usrtvp;
- int error;
- struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
-
- /*
- * AUDIT: Needed to change the order of operations to do the
- * name lookup first because auditing wants the path.
- */
- NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- error = namei(&nd);
- if (error)
- return (error);
- nameidone(&nd);
-
- /*
- * Fetch the user-supplied time. If usrtvp is USER_ADDR_NULL, we fetch
- * the current time instead.
- */
- usrtvp = uap->tptr;
- if ((error = getutimes(usrtvp, ts)) != 0)
- goto out;
-
- error = setutimes(ctx, nd.ni_vp, ts, usrtvp == USER_ADDR_NULL);
-
-out:
- vnode_put(nd.ni_vp);
- return (error);
+ return safe_getpath_new(dvp, leafname, path, _len, truncated_path, 0);
}
/*
- * Set the access and modification times of a file.
+ * Make a hard file link.
+ *
+ * Returns: 0 Success
+ * EPERM
+ * EEXIST
+ * EXDEV
+ * namei:???
+ * vnode_authorize:???
+ * VNOP_LINK:???
*/
/* ARGSUSED */
-int
-futimes(__unused proc_t p, struct futimes_args *uap, __unused register_t *retval)
+static int
+linkat_internal(vfs_context_t ctx, int fd1, user_addr_t path, int fd2,
+ user_addr_t link, int flag, enum uio_seg segflg)
{
- struct timespec ts[2];
- vnode_t vp;
- user_addr_t usrtvp;
+ vnode_t vp, pvp, dvp, lvp;
+ struct nameidata nd;
+ int follow;
int error;
+#if CONFIG_FSE
+ fse_info finfo;
+#endif
+ int need_event, has_listeners, need_kpath2;
+ char *target_path = NULL;
+ int truncated = 0;
- AUDIT_ARG(fd, uap->fd);
- usrtvp = uap->tptr;
- if ((error = getutimes(usrtvp, ts)) != 0)
- return (error);
- if ((error = file_vnode(uap->fd, &vp)) != 0)
- return (error);
- if((error = vnode_getwithref(vp))) {
- file_drop(uap->fd);
- return(error);
- }
-
- error = setutimes(vfs_context_current(), vp, ts, usrtvp == 0);
- vnode_put(vp);
- file_drop(uap->fd);
- return(error);
-}
+ vp = dvp = lvp = NULLVP;
-/*
- * Truncate a file given its path name.
- */
-/* ARGSUSED */
-int
-truncate(__unused proc_t p, struct truncate_args *uap, __unused register_t *retval)
-{
- vnode_t vp;
- struct vnode_attr va;
- vfs_context_t ctx = vfs_context_current();
- int error;
- struct nameidata nd;
- kauth_action_t action;
+ /* look up the object we are linking to */
+ follow = (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW;
+ NDINIT(&nd, LOOKUP, OP_LOOKUP, AUDITVNPATH1 | follow,
+ segflg, path, ctx);
- if (uap->length < 0)
- return(EINVAL);
- NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- if ((error = namei(&nd)))
- return (error);
+ error = nameiat(&nd, fd1);
+ if (error) {
+ return error;
+ }
vp = nd.ni_vp;
nameidone(&nd);
- VATTR_INIT(&va);
- VATTR_SET(&va, va_data_size, uap->length);
-
-#if CONFIG_MACF
- error = mac_vnode_check_truncate(ctx, NOCRED, vp);
- if (error)
- goto out;
-#endif
-
- if ((error = vnode_authattr(vp, &va, &action, ctx)) != 0)
- goto out;
- if ((action != 0) && ((error = vnode_authorize(vp, NULL, action, ctx)) != 0))
- goto out;
- error = vnode_setattr(vp, &va, ctx);
-out:
- vnode_put(vp);
- return (error);
-}
+ /*
+ * Normally, linking to directories is not supported.
+ * However, some file systems may have limited support.
+ */
+ if (vp->v_type == VDIR) {
+ if (!ISSET(vp->v_mount->mnt_kern_flag, MNTK_DIR_HARDLINKS)) {
+ error = EPERM; /* POSIX */
+ goto out;
+ }
-/*
- * Truncate a file given a file descriptor.
- */
-/* ARGSUSED */
-int
-ftruncate(proc_t p, struct ftruncate_args *uap, register_t *retval)
-{
- vfs_context_t ctx = vfs_context_current();
- struct vnode_attr va;
- vnode_t vp;
- struct fileproc *fp;
- int error ;
- int fd = uap->fd;
+ /* Linking to a directory requires ownership. */
+ if (!kauth_cred_issuser(vfs_context_ucred(ctx))) {
+ struct vnode_attr dva;
- AUDIT_ARG(fd, uap->fd);
- if (uap->length < 0)
- return(EINVAL);
-
- if ( (error = fp_lookup(p,fd,&fp,0)) ) {
- return(error);
+ VATTR_INIT(&dva);
+ VATTR_WANTED(&dva, va_uid);
+ if (vnode_getattr(vp, &dva, ctx) != 0 ||
+ !VATTR_IS_SUPPORTED(&dva, va_uid) ||
+ (dva.va_uid != kauth_cred_getuid(vfs_context_ucred(ctx)))) {
+ error = EACCES;
+ goto out;
+ }
+ }
}
- if (fp->f_fglob->fg_type == DTYPE_PSXSHM) {
- error = pshm_truncate(p, fp, uap->fd, uap->length, retval);
+ /* lookup the target node */
+#if CONFIG_TRIGGERS
+ nd.ni_op = OP_LINK;
+#endif
+ nd.ni_cnd.cn_nameiop = CREATE;
+ nd.ni_cnd.cn_flags = LOCKPARENT | AUDITVNPATH2 | CN_NBMOUNTLOOK;
+ nd.ni_dirp = link;
+ error = nameiat(&nd, fd2);
+ if (error != 0) {
goto out;
}
- if (fp->f_fglob->fg_type != DTYPE_VNODE) {
- error = EINVAL;
- goto out;
+ dvp = nd.ni_dvp;
+ lvp = nd.ni_vp;
+
+#if CONFIG_MACF
+ if ((error = mac_vnode_check_link(ctx, dvp, vp, &nd.ni_cnd)) != 0) {
+ goto out2;
}
+#endif
- vp = (vnode_t)fp->f_fglob->fg_data;
+ /* or to anything that kauth doesn't want us to (eg. immutable items) */
+ if ((error = vnode_authorize(vp, NULL, KAUTH_VNODE_LINKTARGET, ctx)) != 0) {
+ goto out2;
+ }
- if ((fp->f_fglob->fg_flag & FWRITE) == 0) {
- AUDIT_ARG(vnpath_withref, vp, ARG_VNODE1);
- error = EINVAL;
- goto out;
+ /* target node must not exist */
+ if (lvp != NULLVP) {
+ error = EEXIST;
+ goto out2;
+ }
+ /* cannot link across mountpoints */
+ if (vnode_mount(vp) != vnode_mount(dvp)) {
+ error = EXDEV;
+ goto out2;
}
- if ((error = vnode_getwithref(vp)) != 0) {
- goto out;
+ /* authorize creation of the target note */
+ if ((error = vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_FILE, ctx)) != 0) {
+ goto out2;
}
- AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+ /* and finally make the link */
+ error = VNOP_LINK(vp, dvp, &nd.ni_cnd, ctx);
+ if (error) {
+ goto out2;
+ }
#if CONFIG_MACF
- error = mac_vnode_check_truncate(ctx,
- fp->f_fglob->fg_cred, vp);
- if (error) {
- (void)vnode_put(vp);
- goto out;
+ (void)mac_vnode_notify_link(ctx, vp, dvp, &nd.ni_cnd);
+#endif
+
+#if CONFIG_FSE
+ need_event = need_fsevent(FSE_CREATE_FILE, dvp);
+#else
+ need_event = 0;
+#endif
+ has_listeners = kauth_authorize_fileop_has_listeners();
+
+ need_kpath2 = 0;
+#if CONFIG_AUDIT
+ if (AUDIT_RECORD_EXISTS()) {
+ need_kpath2 = 1;
}
#endif
- VATTR_INIT(&va);
- VATTR_SET(&va, va_data_size, uap->length);
- error = vnode_setattr(vp, &va, ctx);
- (void)vnode_put(vp);
+
+ if (need_event || has_listeners || need_kpath2) {
+ char *link_to_path = NULL;
+ int len, link_name_len;
+
+ /* build the path to the new link file */
+ GET_PATH(target_path);
+
+ len = safe_getpath(dvp, nd.ni_cnd.cn_nameptr, target_path, MAXPATHLEN, &truncated);
+
+ AUDIT_ARG(kpath, target_path, ARG_KPATH2);
+
+ if (has_listeners) {
+ /* build the path to file we are linking to */
+ GET_PATH(link_to_path);
+
+ link_name_len = MAXPATHLEN;
+ if (vn_getpath(vp, link_to_path, &link_name_len) == 0) {
+ /*
+ * Call out to allow 3rd party notification of rename.
+ * Ignore result of kauth_authorize_fileop call.
+ */
+ kauth_authorize_fileop(vfs_context_ucred(ctx), KAUTH_FILEOP_LINK,
+ (uintptr_t)link_to_path,
+ (uintptr_t)target_path);
+ }
+ if (link_to_path != NULL) {
+ RELEASE_PATH(link_to_path);
+ }
+ }
+#if CONFIG_FSE
+ if (need_event) {
+ /* construct fsevent */
+ if (get_fse_info(vp, &finfo, ctx) == 0) {
+ if (truncated) {
+ finfo.mode |= FSE_TRUNCATED_PATH;
+ }
+
+ // build the path to the destination of the link
+ add_fsevent(FSE_CREATE_FILE, ctx,
+ FSE_ARG_STRING, len, target_path,
+ FSE_ARG_FINFO, &finfo,
+ FSE_ARG_DONE);
+ }
+
+ pvp = vp->v_parent;
+ // need an iocount on pvp in this case
+ if (pvp && pvp != dvp) {
+ error = vnode_get(pvp);
+ if (error) {
+ pvp = NULLVP;
+ error = 0;
+ }
+ }
+ if (pvp) {
+ add_fsevent(FSE_STAT_CHANGED, ctx,
+ FSE_ARG_VNODE, pvp, FSE_ARG_DONE);
+ }
+ if (pvp && pvp != dvp) {
+ vnode_put(pvp);
+ }
+ }
+#endif
+ }
+out2:
+ /*
+ * nameidone has to happen before we vnode_put(dvp)
+ * since it may need to release the fs_nodelock on the dvp
+ */
+ nameidone(&nd);
+ if (target_path != NULL) {
+ RELEASE_PATH(target_path);
+ }
out:
- file_drop(fd);
- return (error);
+ if (lvp) {
+ vnode_put(lvp);
+ }
+ if (dvp) {
+ vnode_put(dvp);
+ }
+ vnode_put(vp);
+ return error;
}
-
-/*
- * Sync an open file.
- */
-/* ARGSUSED */
int
-fsync(proc_t p, struct fsync_args *uap, register_t *retval)
+link(__unused proc_t p, struct link_args *uap, __unused int32_t *retval)
{
- __pthread_testcancel(1);
- return(fsync_nocancel(p, (struct fsync_nocancel_args *)uap, retval));
+ return linkat_internal(vfs_context_current(), AT_FDCWD, uap->path,
+ AT_FDCWD, uap->link, AT_SYMLINK_FOLLOW, UIO_USERSPACE);
}
int
-fsync_nocancel(proc_t p, struct fsync_nocancel_args *uap, __unused register_t *retval)
+linkat(__unused proc_t p, struct linkat_args *uap, __unused int32_t *retval)
{
- vnode_t vp;
- struct fileproc *fp;
- vfs_context_t ctx = vfs_context_current();
- int error;
-
- if ( (error = fp_getfvp(p, uap->fd, &fp, &vp)) )
- return (error);
- if ( (error = vnode_getwithref(vp)) ) {
- file_drop(uap->fd);
- return(error);
- }
-
- error = VNOP_FSYNC(vp, MNT_WAIT, ctx);
-
-#if NAMEDRSRCFORK
- /* Sync resource fork shadow file if necessary. */
- if ((error == 0) &&
- (vp->v_flag & VISNAMEDSTREAM) &&
- (vp->v_parent != NULLVP) &&
- !(vp->v_parent->v_mount->mnt_kern_flag & MNTK_NAMED_STREAMS) &&
- (fp->f_flags & FP_WRITTEN)) {
- (void) vnode_flushnamedstream(vp->v_parent, vp, ctx);
+ if (uap->flag & ~AT_SYMLINK_FOLLOW) {
+ return EINVAL;
}
-#endif
- (void)vnode_put(vp);
- file_drop(uap->fd);
- return (error);
+ return linkat_internal(vfs_context_current(), uap->fd1, uap->path,
+ uap->fd2, uap->link, uap->flag, UIO_USERSPACE);
}
/*
- * Duplicate files. Source must be a file, target must be a file or
- * must not exist.
+ * Make a symbolic link.
*
- * XXX Copyfile authorisation checking is woefully inadequate, and will not
- * perform inheritance correctly.
+ * We could add support for ACLs here too...
*/
/* ARGSUSED */
-int
-copyfile(__unused proc_t p, struct copyfile_args *uap, __unused register_t *retval)
+static int
+symlinkat_internal(vfs_context_t ctx, user_addr_t path_data, int fd,
+ user_addr_t link, enum uio_seg segflg)
{
- vnode_t tvp, fvp, tdvp, sdvp;
- struct nameidata fromnd, tond;
+ struct vnode_attr va;
+ char *path;
int error;
- vfs_context_t ctx = vfs_context_current();
+ struct nameidata nd;
+ vnode_t vp, dvp;
+ size_t dummy = 0;
+ proc_t p;
- /* Check that the flags are valid. */
+ error = 0;
+ if (UIO_SEG_IS_USER_SPACE(segflg)) {
+ path = zalloc(ZV_NAMEI);
+ error = copyinstr(path_data, path, MAXPATHLEN, &dummy);
+ } else {
+ path = (char *)path_data;
+ }
+ if (error) {
+ goto out;
+ }
+ AUDIT_ARG(text, path); /* This is the link string */
- if (uap->flags & ~CPF_MASK) {
- return(EINVAL);
+ NDINIT(&nd, CREATE, OP_SYMLINK, LOCKPARENT | AUDITVNPATH1,
+ segflg, link, ctx);
+
+ error = nameiat(&nd, fd);
+ if (error) {
+ goto out;
}
+ dvp = nd.ni_dvp;
+ vp = nd.ni_vp;
- NDINIT(&fromnd, LOOKUP, SAVESTART | AUDITVNPATH1,
- UIO_USERSPACE, uap->from, ctx);
- if ((error = namei(&fromnd)))
- return (error);
- fvp = fromnd.ni_vp;
+ p = vfs_context_proc(ctx);
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_type, VLNK);
+ VATTR_SET(&va, va_mode, ACCESSPERMS & ~p->p_fd->fd_cmask);
- NDINIT(&tond, CREATE, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | AUDITVNPATH2 | CN_NBMOUNTLOOK,
- UIO_USERSPACE, uap->to, ctx);
- if ((error = namei(&tond))) {
- goto out1;
+#if CONFIG_MACF
+ error = mac_vnode_check_create(ctx,
+ dvp, &nd.ni_cnd, &va);
+#endif
+ if (error != 0) {
+ goto skipit;
}
- tdvp = tond.ni_dvp;
- tvp = tond.ni_vp;
- if (tvp != NULL) {
- if (!(uap->flags & CPF_OVERWRITE)) {
- error = EEXIST;
- goto out;
- }
+ if (vp != NULL) {
+ error = EEXIST;
+ goto skipit;
}
- if (fvp->v_type == VDIR || (tvp && tvp->v_type == VDIR)) {
- error = EISDIR;
- goto out;
+
+ /* authorize */
+ if (error == 0) {
+ error = vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_FILE, ctx);
+ }
+ /* get default ownership, etc. */
+ if (error == 0) {
+ error = vnode_authattr_new(dvp, &va, 0, ctx);
+ }
+ if (error == 0) {
+ error = VNOP_SYMLINK(dvp, &vp, &nd.ni_cnd, &va, path, ctx);
}
- if ((error = vnode_authorize(tdvp, NULL, KAUTH_VNODE_ADD_FILE, ctx)) != 0)
- goto out;
+ /* do fallback attribute handling */
+ if (error == 0 && vp) {
+ error = vnode_setattr_fallback(vp, &va, ctx);
+ }
- if (fvp == tdvp)
- error = EINVAL;
+#if CONFIG_MACF
+ if (error == 0 && vp) {
+ error = vnode_label(vnode_mount(vp), dvp, vp, &nd.ni_cnd, VNODE_LABEL_CREATE, ctx);
+ }
+#endif
+
+ if (error == 0) {
+ int update_flags = 0;
+
+ /*check if a new vnode was created, else try to get one*/
+ if (vp == NULL) {
+ nd.ni_cnd.cn_nameiop = LOOKUP;
+#if CONFIG_TRIGGERS
+ nd.ni_op = OP_LOOKUP;
+#endif
+ nd.ni_cnd.cn_flags = 0;
+ error = nameiat(&nd, fd);
+ vp = nd.ni_vp;
+
+ if (vp == NULL) {
+ goto skipit;
+ }
+ }
+
+#if 0 /* XXX - kauth_todo - is KAUTH_FILEOP_SYMLINK needed? */
+ /* call out to allow 3rd party notification of rename.
+ * Ignore result of kauth_authorize_fileop call.
+ */
+ if (kauth_authorize_fileop_has_listeners() &&
+ namei(&nd) == 0) {
+ char *new_link_path = NULL;
+ int len;
+
+ /* build the path to the new link file */
+ new_link_path = get_pathbuff();
+ len = MAXPATHLEN;
+ vn_getpath(dvp, new_link_path, &len);
+ if ((len + 1 + nd.ni_cnd.cn_namelen + 1) < MAXPATHLEN) {
+ new_link_path[len - 1] = '/';
+ strlcpy(&new_link_path[len], nd.ni_cnd.cn_nameptr, MAXPATHLEN - len);
+ }
+
+ kauth_authorize_fileop(vfs_context_ucred(ctx), KAUTH_FILEOP_SYMLINK,
+ (uintptr_t)path, (uintptr_t)new_link_path);
+ if (new_link_path != NULL) {
+ release_pathbuff(new_link_path);
+ }
+ }
+#endif
+ // Make sure the name & parent pointers are hooked up
+ if (vp->v_name == NULL) {
+ update_flags |= VNODE_UPDATE_NAME;
+ }
+ if (vp->v_parent == NULLVP) {
+ update_flags |= VNODE_UPDATE_PARENT;
+ }
+
+ if (update_flags) {
+ vnode_update_identity(vp, dvp, nd.ni_cnd.cn_nameptr, nd.ni_cnd.cn_namelen, nd.ni_cnd.cn_hash, update_flags);
+ }
+
+#if CONFIG_FSE
+ add_fsevent(FSE_CREATE_FILE, ctx,
+ FSE_ARG_VNODE, vp,
+ FSE_ARG_DONE);
+#endif
+ }
+
+skipit:
/*
- * If source is the same as the destination (that is the
- * same inode number) then there is nothing to do.
- * (fixed to have POSIX semantics - CSM 3/2/98)
+ * nameidone has to happen before we vnode_put(dvp)
+ * since it may need to release the fs_nodelock on the dvp
*/
- if (fvp == tvp)
- error = -1;
- if (!error)
- error = VNOP_COPYFILE(fvp, tdvp, tvp, &tond.ni_cnd, uap->mode, uap->flags, ctx);
+ nameidone(&nd);
+
+ if (vp) {
+ vnode_put(vp);
+ }
+ vnode_put(dvp);
out:
- sdvp = tond.ni_startdir;
- /*
- * nameidone has to happen before we vnode_put(tdvp)
- * since it may need to release the fs_nodelock on the tdvp
- */
- nameidone(&tond);
+ if (path && (path != (char *)path_data)) {
+ zfree(ZV_NAMEI, path);
+ }
- if (tvp)
- vnode_put(tvp);
- vnode_put(tdvp);
- vnode_put(sdvp);
-out1:
- vnode_put(fvp);
+ return error;
+}
- if (fromnd.ni_startdir)
- vnode_put(fromnd.ni_startdir);
- nameidone(&fromnd);
+int
+symlink(__unused proc_t p, struct symlink_args *uap, __unused int32_t *retval)
+{
+ return symlinkat_internal(vfs_context_current(), uap->path, AT_FDCWD,
+ uap->link, UIO_USERSPACE);
+}
- if (error == -1)
- return (0);
- return (error);
+int
+symlinkat(__unused proc_t p, struct symlinkat_args *uap,
+ __unused int32_t *retval)
+{
+ return symlinkat_internal(vfs_context_current(), uap->path1, uap->fd,
+ uap->path2, UIO_USERSPACE);
}
+/*
+ * Delete a whiteout from the filesystem.
+ * No longer supported.
+ */
+int
+undelete(__unused proc_t p, __unused struct undelete_args *uap, __unused int32_t *retval)
+{
+ return ENOTSUP;
+}
/*
- * Rename files. Source and destination must either both be directories,
- * or both not be directories. If target is a directory, it must be empty.
+ * Delete a name from the filesystem.
*/
/* ARGSUSED */
-int
-rename(__unused proc_t p, struct rename_args *uap, __unused register_t *retval)
+static int
+unlinkat_internal(vfs_context_t ctx, int fd, vnode_t start_dvp,
+ user_addr_t path_arg, enum uio_seg segflg, int unlink_flags)
{
- vnode_t tvp, tdvp;
- vnode_t fvp, fdvp;
- struct nameidata fromnd, tond;
- vfs_context_t ctx = vfs_context_current();
+ struct nameidata nd;
+ vnode_t vp, dvp;
int error;
- int do_retry;
- int mntrename;
+ struct componentname *cnp;
+ char *path = NULL;
+ char *no_firmlink_path = NULL;
+ int len_path = 0;
+ int len_no_firmlink_path = 0;
+#if CONFIG_FSE
+ fse_info finfo;
+ struct vnode_attr va;
+#endif
+ int flags;
int need_event;
- const char *oname;
- char *from_name = NULL, *to_name = NULL;
- int from_len, to_len;
- int holding_mntlock;
- mount_t locked_mp = NULL;
- vnode_t oparent;
- fse_info from_finfo, to_finfo;
-
- holding_mntlock = 0;
- do_retry = 0;
-retry:
- fvp = tvp = NULL;
- fdvp = tdvp = NULL;
- mntrename = FALSE;
+ int has_listeners;
+ int truncated_path;
+ int truncated_no_firmlink_path;
+ int batched;
+ struct vnode_attr *vap;
+ int do_retry;
+ int retry_count = 0;
+ int cn_flags;
- NDINIT(&fromnd, DELETE, WANTPARENT | AUDITVNPATH1, UIO_USERSPACE, uap->from, ctx);
-
- if ( (error = namei(&fromnd)) )
- goto out1;
- fdvp = fromnd.ni_dvp;
- fvp = fromnd.ni_vp;
+ cn_flags = LOCKPARENT;
+ if (!(unlink_flags & VNODE_REMOVE_NO_AUDIT_PATH)) {
+ cn_flags |= AUDITVNPATH1;
+ }
+ /* If a starting dvp is passed, it trumps any fd passed. */
+ if (start_dvp) {
+ cn_flags |= USEDVP;
+ }
-#if CONFIG_MACF
- error = mac_vnode_check_rename_from(ctx, fdvp, fvp, &fromnd.ni_cnd);
- if (error)
- goto out1;
+#if NAMEDRSRCFORK
+ /* unlink or delete is allowed on rsrc forks and named streams */
+ cn_flags |= CN_ALLOWRSRCFORK;
#endif
- NDINIT(&tond, RENAME, WANTPARENT | AUDITVNPATH2 | CN_NBMOUNTLOOK , UIO_USERSPACE, uap->to, ctx);
- if (fvp->v_type == VDIR)
- tond.ni_cnd.cn_flags |= WILLBEDIR;
+retry:
+ do_retry = 0;
+ flags = 0;
+ need_event = 0;
+ has_listeners = 0;
+ truncated_path = 0;
+ truncated_no_firmlink_path = 0;
+ vap = NULL;
+
+ NDINIT(&nd, DELETE, OP_UNLINK, cn_flags, segflg, path_arg, ctx);
- if ( (error = namei(&tond)) ) {
- /*
- * Translate error code for rename("dir1", "dir2/.").
- */
- if (error == EISDIR && fvp->v_type == VDIR)
- error = EINVAL;
- goto out1;
+ nd.ni_dvp = start_dvp;
+ nd.ni_flag |= NAMEI_COMPOUNDREMOVE;
+ cnp = &nd.ni_cnd;
+
+continue_lookup:
+ error = nameiat(&nd, fd);
+ if (error) {
+ return error;
}
- tdvp = tond.ni_dvp;
- tvp = tond.ni_vp;
-#if CONFIG_MACF
- error = mac_vnode_check_rename_to(ctx,
- tdvp, tvp, fdvp == tdvp, &tond.ni_cnd);
- if (error)
- goto out1;
-#endif
+ dvp = nd.ni_dvp;
+ vp = nd.ni_vp;
- if (tvp != NULL) {
- if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
- error = ENOTDIR;
- goto out1;
- } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
- error = EISDIR;
- goto out1;
- }
+
+ /* With Carbon delete semantics, busy files cannot be deleted */
+ if (unlink_flags & VNODE_REMOVE_NODELETEBUSY) {
+ flags |= VNODE_REMOVE_NODELETEBUSY;
}
- if (fvp == tdvp) {
- error = EINVAL;
- goto out1;
+
+ /* Skip any potential upcalls if told to. */
+ if (unlink_flags & VNODE_REMOVE_SKIP_NAMESPACE_EVENT) {
+ flags |= VNODE_REMOVE_SKIP_NAMESPACE_EVENT;
}
- /*
- * If the source and destination are the same (i.e. they're
- * links to the same vnode) and the target file system is
- * case sensitive, then there is nothing to do.
- */
- if (fvp == tvp) {
- int pathconf_val;
-
+
+ if (vp) {
+ batched = vnode_compound_remove_available(vp);
/*
- * Note: if _PC_CASE_SENSITIVE selector isn't supported,
- * then assume that this file system is case sensitive.
+ * The root of a mounted filesystem cannot be deleted.
*/
- if (VNOP_PATHCONF(fvp, _PC_CASE_SENSITIVE, &pathconf_val, ctx) != 0 ||
- pathconf_val != 0) {
- goto out1;
- }
- }
-
- /*
- * Authorization.
- *
- * If tvp is a directory and not the same as fdvp, or tdvp is not
- * the same as fdvp, the node is moving between directories and we
- * need rights to remove from the old and add to the new.
- *
- * If tvp already exists and is not a directory, we need to be
- * allowed to delete it.
- *
- * Note that we do not inherit when renaming.
- *
- * XXX This needs to be revisited to implement the deferred-inherit bit
- */
- {
- int moving = 0;
-
- error = 0;
- if ((tvp != NULL) && vnode_isdir(tvp)) {
- if (tvp != fdvp)
- moving = 1;
- } else if (tdvp != fdvp) {
- moving = 1;
+ if ((vp->v_flag & VROOT) || (dvp->v_mount != vp->v_mount)) {
+ error = EBUSY;
+ goto out;
}
+
+#if DEVELOPMENT || DEBUG
/*
- * must have delete rights to remove the old name even in
- * the simple case of fdvp == tdvp.
- *
- * If fvp is a directory, and we are changing it's parent,
- * then we also need rights to rewrite its ".." entry as well.
+ * XXX VSWAP: Check for entitlements or special flag here
+ * so we can restrict access appropriately.
*/
- if (vnode_isdir(fvp)) {
- if ((error = vnode_authorize(fvp, fdvp, KAUTH_VNODE_DELETE | KAUTH_VNODE_ADD_SUBDIRECTORY, ctx)) != 0)
- goto auth_exit;
- } else {
- if ((error = vnode_authorize(fvp, fdvp, KAUTH_VNODE_DELETE, ctx)) != 0)
- goto auth_exit;
- }
- if (moving) {
- /* moving into tdvp or tvp, must have rights to add */
- if ((error = vnode_authorize(((tvp != NULL) && vnode_isdir(tvp)) ? tvp : tdvp,
- NULL,
- vnode_isdir(fvp) ? KAUTH_VNODE_ADD_SUBDIRECTORY : KAUTH_VNODE_ADD_FILE,
- ctx)) != 0) {
- /*
- * We could encounter a race where after doing the namei, tvp stops
- * being valid. If so, simply re-drive the rename call from the
- * top.
- */
- if (error == ENOENT) {
- do_retry = 1;
- }
- goto auth_exit;
+#else /* DEVELOPMENT || DEBUG */
+
+ if (vnode_isswap(vp) && (ctx != vfs_context_kernel())) {
+ error = EPERM;
+ goto out;
+ }
+#endif /* DEVELOPMENT || DEBUG */
+
+ if (!batched) {
+ error = vn_authorize_unlink(dvp, vp, cnp, ctx, NULL);
+ if (error) {
+ if (error == ENOENT) {
+ if (retry_count < MAX_AUTHORIZE_ENOENT_RETRIES) {
+ do_retry = 1;
+ retry_count++;
+ }
+ }
+ goto out;
}
- } else {
- /* node staying in same directory, must be allowed to add new name */
- if ((error = vnode_authorize(fdvp, NULL,
- vnode_isdir(fvp) ? KAUTH_VNODE_ADD_SUBDIRECTORY : KAUTH_VNODE_ADD_FILE, ctx)) != 0)
- goto auth_exit;
- }
- /* overwriting tvp */
- if ((tvp != NULL) && !vnode_isdir(tvp) &&
- ((error = vnode_authorize(tvp, tdvp, KAUTH_VNODE_DELETE, ctx)) != 0)) {
- /*
- * We could encounter a race where after doing the namei, tvp stops
- * being valid. If so, simply re-drive the rename call from the
- * top.
- */
- if (error == ENOENT) {
- do_retry = 1;
- }
- goto auth_exit;
- }
-
- /* XXX more checks? */
-
-auth_exit:
- /* authorization denied */
- if (error != 0)
- goto out1;
- }
- /*
- * Allow the renaming of mount points.
- * - target must not exist
- * - target must reside in the same directory as source
- * - union mounts cannot be renamed
- * - "/" cannot be renamed
- */
- if ((fvp->v_flag & VROOT) &&
- (fvp->v_type == VDIR) &&
- (tvp == NULL) &&
- (fvp->v_mountedhere == NULL) &&
- (fdvp == tdvp) &&
- ((fvp->v_mount->mnt_flag & (MNT_UNION | MNT_ROOTFS)) == 0) &&
- (fvp->v_mount->mnt_vnodecovered != NULLVP)) {
- vnode_t coveredvp;
-
- /* switch fvp to the covered vnode */
- coveredvp = fvp->v_mount->mnt_vnodecovered;
- if ( (vnode_getwithref(coveredvp)) ) {
- error = ENOENT;
- goto out1;
}
- vnode_put(fvp);
+ } else {
+ batched = 1;
- fvp = coveredvp;
- mntrename = TRUE;
+ if (!vnode_compound_remove_available(dvp)) {
+ panic("No vp, but no compound remove?");
+ }
}
- /*
- * Check for cross-device rename.
- */
- if ((fvp->v_mount != tdvp->v_mount) ||
- (tvp && (fvp->v_mount != tvp->v_mount))) {
- error = EXDEV;
- goto out1;
- }
- /*
- * Avoid renaming "." and "..".
- */
- if (fvp->v_type == VDIR &&
- ((fdvp == fvp) ||
- (fromnd.ni_cnd.cn_namelen == 1 && fromnd.ni_cnd.cn_nameptr[0] == '.') ||
- ((fromnd.ni_cnd.cn_flags | tond.ni_cnd.cn_flags) & ISDOTDOT)) ) {
- error = EINVAL;
- goto out1;
- }
- /*
- * The following edge case is caught here:
- * (to cannot be a descendent of from)
- *
- * o fdvp
- * /
- * /
- * o fvp
- * \
- * \
- * o tdvp
- * /
- * /
- * o tvp
- */
- if (tdvp->v_parent == fvp) {
- error = EINVAL;
- goto out1;
- }
-
- /*
- * If source is the same as the destination (that is the
- * same inode number) then there is nothing to do...
- * EXCEPT if the underlying file system supports case
- * insensitivity and is case preserving. In this case
- * the file system needs to handle the special case of
- * getting the same vnode as target (fvp) and source (tvp).
- *
- * Only file systems that support pathconf selectors _PC_CASE_SENSITIVE
- * and _PC_CASE_PRESERVING can have this exception, and they need to
- * handle the special case of getting the same vnode as target and
- * source. NOTE: Then the target is unlocked going into vnop_rename,
- * so not to cause locking problems. There is a single reference on tvp.
- *
- * NOTE - that fvp == tvp also occurs if they are hard linked - NOTE
- * that correct behaviour then is just to remove the source (link)
- */
- if (fvp == tvp && fdvp == tdvp) {
- if (fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen &&
- !bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr,
- fromnd.ni_cnd.cn_namelen)) {
- goto out1;
- }
- }
-
- if (holding_mntlock && fvp->v_mount != locked_mp) {
- /*
- * we're holding a reference and lock
- * on locked_mp, but it no longer matches
- * what we want to do... so drop our hold
- */
- mount_unlock_renames(locked_mp);
- mount_drop(locked_mp, 0);
- holding_mntlock = 0;
- }
- if (tdvp != fdvp && fvp->v_type == VDIR) {
- /*
- * serialize renames that re-shape
- * the tree... if holding_mntlock is
- * set, then we're ready to go...
- * otherwise we
- * first need to drop the iocounts
- * we picked up, second take the
- * lock to serialize the access,
- * then finally start the lookup
- * process over with the lock held
- */
- if (!holding_mntlock) {
- /*
- * need to grab a reference on
- * the mount point before we
- * drop all the iocounts... once
- * the iocounts are gone, the mount
- * could follow
- */
- locked_mp = fvp->v_mount;
- mount_ref(locked_mp, 0);
-
- /*
- * nameidone has to happen before we vnode_put(tvp)
- * since it may need to release the fs_nodelock on the tvp
- */
- nameidone(&tond);
-
- if (tvp)
- vnode_put(tvp);
- vnode_put(tdvp);
-
- /*
- * nameidone has to happen before we vnode_put(fdvp)
- * since it may need to release the fs_nodelock on the fvp
- */
- nameidone(&fromnd);
-
- vnode_put(fvp);
- vnode_put(fdvp);
-
- mount_lock_renames(locked_mp);
- holding_mntlock = 1;
-
- goto retry;
- }
- } else {
- /*
- * when we dropped the iocounts to take
- * the lock, we allowed the identity of
- * the various vnodes to change... if they did,
- * we may no longer be dealing with a rename
- * that reshapes the tree... once we're holding
- * the iocounts, the vnodes can't change type
- * so we're free to drop the lock at this point
- * and continue on
- */
- if (holding_mntlock) {
- mount_unlock_renames(locked_mp);
- mount_drop(locked_mp, 0);
- holding_mntlock = 0;
- }
- }
- // save these off so we can later verify that fvp is the same
- oname = fvp->v_name;
- oparent = fvp->v_parent;
#if CONFIG_FSE
- need_event = need_fsevent(FSE_RENAME, fvp);
- if (need_event) {
- get_fse_info(fvp, &from_finfo, ctx);
+ need_event = need_fsevent(FSE_DELETE, dvp);
+ if (need_event) {
+ if (!batched) {
+ if ((vp->v_flag & VISHARDLINK) == 0) {
+ /* XXX need to get these data in batched VNOP */
+ get_fse_info(vp, &finfo, ctx);
+ }
+ } else {
+ error = vfs_get_notify_attributes(&va);
+ if (error) {
+ goto out;
+ }
- if (tvp) {
- get_fse_info(tvp, &to_finfo, ctx);
+ vap = &va;
}
}
-#else
- need_event = 0;
-#endif /* CONFIG_FSE */
-
- if (need_event || kauth_authorize_fileop_has_listeners()) {
- GET_PATH(from_name);
- if (from_name == NULL) {
- error = ENOMEM;
- goto out1;
+#endif
+ has_listeners = kauth_authorize_fileop_has_listeners();
+ if (need_event || has_listeners) {
+ if (path == NULL) {
+ GET_PATH(path);
}
- from_len = MAXPATHLEN;
- vn_getpath(fdvp, from_name, &from_len);
- if ((from_len + 1 + fromnd.ni_cnd.cn_namelen + 1) < MAXPATHLEN) {
- if (from_len > 2) {
- from_name[from_len-1] = '/';
- } else {
- from_len--;
- }
- strlcpy(&from_name[from_len], fromnd.ni_cnd.cn_nameptr, MAXPATHLEN-from_len);
- from_len += fromnd.ni_cnd.cn_namelen + 1;
- from_name[from_len] = '\0';
+ len_path = safe_getpath(dvp, nd.ni_cnd.cn_nameptr, path, MAXPATHLEN, &truncated_path);
+ if (no_firmlink_path == NULL) {
+ GET_PATH(no_firmlink_path);
}
+ len_no_firmlink_path = safe_getpath_no_firmlink(dvp, nd.ni_cnd.cn_nameptr, no_firmlink_path, MAXPATHLEN, &truncated_no_firmlink_path);
+ }
- GET_PATH(to_name);
- if (to_name == NULL) {
- error = ENOMEM;
- goto out1;
- }
+#if NAMEDRSRCFORK
+ if (nd.ni_cnd.cn_flags & CN_WANTSRSRCFORK) {
+ error = vnode_removenamedstream(dvp, vp, XATTR_RESOURCEFORK_NAME, 0, ctx);
+ } else
+#endif
+ {
+ error = vn_remove(dvp, &nd.ni_vp, &nd, flags, vap, ctx);
+ vp = nd.ni_vp;
+ if (error == EKEEPLOOKING) {
+ if (!batched) {
+ panic("EKEEPLOOKING, but not a filesystem that supports compound VNOPs?");
+ }
- to_len = MAXPATHLEN;
- vn_getpath(tdvp, to_name, &to_len);
- // if the path is not just "/", then append a "/"
- if ((to_len + 1 + tond.ni_cnd.cn_namelen + 1) < MAXPATHLEN) {
- if (to_len > 2) {
- to_name[to_len-1] = '/';
- } else {
- to_len--;
- }
- strlcpy(&to_name[to_len], tond.ni_cnd.cn_nameptr, MAXPATHLEN-to_len);
- to_len += tond.ni_cnd.cn_namelen + 1;
- to_name[to_len] = '\0';
- }
- }
-
- error = VNOP_RENAME(fdvp, fvp, &fromnd.ni_cnd,
- tdvp, tvp, &tond.ni_cnd,
- ctx);
+ if ((nd.ni_flag & NAMEI_CONTLOOKUP) == 0) {
+ panic("EKEEPLOOKING, but continue flag not set?");
+ }
- if (holding_mntlock) {
- /*
- * we can drop our serialization
- * lock now
- */
- mount_unlock_renames(locked_mp);
- mount_drop(locked_mp, 0);
- holding_mntlock = 0;
+ if (vnode_isdir(vp)) {
+ error = EISDIR;
+ goto out;
+ }
+ goto continue_lookup;
+ } else if (error == ENOENT && batched) {
+ if (retry_count < MAX_AUTHORIZE_ENOENT_RETRIES) {
+ /*
+ * For compound VNOPs, the authorization callback may
+ * return ENOENT in case of racing hardlink lookups
+ * hitting the name cache, redrive the lookup.
+ */
+ do_retry = 1;
+ retry_count += 1;
+ goto out;
+ }
+ }
}
- if (error) {
- /*
- * We may encounter a race in the VNOP where the destination didn't
- * exist when we did the namei, but it does by the time we go and
- * try to create the entry. In this case, we should re-drive this rename
- * call from the top again.
- */
- if (error == EEXIST) {
- do_retry = 1;
- }
- goto out1;
- }
-
- /* call out to allow 3rd party notification of rename.
+ /*
+ * Call out to allow 3rd party notification of delete.
* Ignore result of kauth_authorize_fileop call.
*/
- kauth_authorize_fileop(vfs_context_ucred(ctx),
- KAUTH_FILEOP_RENAME,
- (uintptr_t)from_name, (uintptr_t)to_name);
-
-#if CONFIG_FSE
- if (from_name != NULL && to_name != NULL) {
- if (tvp) {
- add_fsevent(FSE_RENAME, ctx,
- FSE_ARG_STRING, from_len, from_name,
- FSE_ARG_FINFO, &from_finfo,
- FSE_ARG_STRING, to_len, to_name,
- FSE_ARG_FINFO, &to_finfo,
- FSE_ARG_DONE);
- } else {
- add_fsevent(FSE_RENAME, ctx,
- FSE_ARG_STRING, from_len, from_name,
- FSE_ARG_FINFO, &from_finfo,
- FSE_ARG_STRING, to_len, to_name,
- FSE_ARG_DONE);
+ if (!error) {
+ if (has_listeners) {
+ kauth_authorize_fileop(vfs_context_ucred(ctx),
+ KAUTH_FILEOP_DELETE,
+ (uintptr_t)vp,
+ (uintptr_t)path);
}
- }
-#endif /* CONFIG_FSE */
-
- /*
- * update filesystem's mount point data
- */
- if (mntrename) {
- char *cp, *pathend, *mpname;
- char * tobuf;
- struct mount *mp;
- int maxlen;
- size_t len = 0;
- mp = fvp->v_mountedhere;
-
- if (vfs_busy(mp, LK_NOWAIT)) {
- error = EBUSY;
- goto out1;
+ if (vp->v_flag & VISHARDLINK) {
+ //
+ // if a hardlink gets deleted we want to blow away the
+ // v_parent link because the path that got us to this
+ // instance of the link is no longer valid. this will
+ // force the next call to get the path to ask the file
+ // system instead of just following the v_parent link.
+ //
+ vnode_update_identity(vp, NULL, NULL, 0, 0, VNODE_UPDATE_PARENT);
}
- MALLOC_ZONE(tobuf, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
- error = copyinstr(uap->to, tobuf, MAXPATHLEN, &len);
- if (!error) {
- /* find current mount point prefix */
- pathend = &mp->mnt_vfsstat.f_mntonname[0];
- for (cp = pathend; *cp != '\0'; ++cp) {
- if (*cp == '/')
- pathend = cp + 1;
+#if CONFIG_FSE
+ if (need_event) {
+ if (vp->v_flag & VISHARDLINK) {
+ get_fse_info(vp, &finfo, ctx);
+ } else if (vap) {
+ vnode_get_fse_info_from_vap(vp, &finfo, vap);
}
- /* find last component of target name */
- for (mpname = cp = tobuf; *cp != '\0'; ++cp) {
- if (*cp == '/')
- mpname = cp + 1;
+ if (truncated_path) {
+ finfo.mode |= FSE_TRUNCATED_PATH;
}
- /* append name to prefix */
- maxlen = MAXPATHLEN - (pathend - mp->mnt_vfsstat.f_mntonname);
- bzero(pathend, maxlen);
- strlcpy(pathend, mpname, maxlen);
+ add_fsevent(FSE_DELETE, ctx,
+ FSE_ARG_STRING, len_no_firmlink_path, no_firmlink_path,
+ FSE_ARG_FINFO, &finfo,
+ FSE_ARG_DONE);
}
- FREE_ZONE(tobuf, MAXPATHLEN, M_NAMEI);
-
- vfs_unbusy(mp);
+#endif
}
- /*
- * fix up name & parent pointers. note that we first
- * check that fvp has the same name/parent pointers it
- * had before the rename call... this is a 'weak' check
- * at best...
- */
- if (oname == fvp->v_name && oparent == fvp->v_parent) {
- int update_flags;
-
- update_flags = VNODE_UPDATE_NAME;
-
- if (fdvp != tdvp)
- update_flags |= VNODE_UPDATE_PARENT;
- vnode_update_identity(fvp, tdvp, tond.ni_cnd.cn_nameptr, tond.ni_cnd.cn_namelen, tond.ni_cnd.cn_hash, update_flags);
- }
-out1:
- if (to_name != NULL) {
- RELEASE_PATH(to_name);
- to_name = NULL;
- }
- if (from_name != NULL) {
- RELEASE_PATH(from_name);
- from_name = NULL;
- }
- if (holding_mntlock) {
- mount_unlock_renames(locked_mp);
- mount_drop(locked_mp, 0);
- holding_mntlock = 0;
+out:
+ if (path != NULL) {
+ RELEASE_PATH(path);
+ path = NULL;
}
- if (tdvp) {
- /*
- * nameidone has to happen before we vnode_put(tdvp)
- * since it may need to release the fs_nodelock on the tdvp
- */
- nameidone(&tond);
- if (tvp)
- vnode_put(tvp);
- vnode_put(tdvp);
+ if (no_firmlink_path != NULL) {
+ RELEASE_PATH(no_firmlink_path);
+ no_firmlink_path = NULL;
}
- if (fdvp) {
- /*
- * nameidone has to happen before we vnode_put(fdvp)
- * since it may need to release the fs_nodelock on the fdvp
- */
- nameidone(&fromnd);
-
- if (fvp)
- vnode_put(fvp);
- vnode_put(fdvp);
+#if NAMEDRSRCFORK
+ /* recycle the deleted rsrc fork vnode to force a reclaim, which
+ * will cause its shadow file to go away if necessary.
+ */
+ if (vp && (vnode_isnamedstream(vp)) &&
+ (vp->v_parent != NULLVP) &&
+ vnode_isshadow(vp)) {
+ vnode_recycle(vp);
+ }
+#endif
+ /*
+ * nameidone has to happen before we vnode_put(dvp)
+ * since it may need to release the fs_nodelock on the dvp
+ */
+ nameidone(&nd);
+ vnode_put(dvp);
+ if (vp) {
+ vnode_put(vp);
}
- /*
- * If things changed after we did the namei, then we will re-drive
- * this rename call from the top.
- */
- if(do_retry) {
- do_retry = 0;
+ if (do_retry) {
goto retry;
}
- return (error);
+ return error;
+}
+
+int
+unlink1(vfs_context_t ctx, vnode_t start_dvp, user_addr_t path_arg,
+ enum uio_seg segflg, int unlink_flags)
+{
+ return unlinkat_internal(ctx, AT_FDCWD, start_dvp, path_arg, segflg,
+ unlink_flags);
}
/*
- * Make a directory file.
- *
- * Returns: 0 Success
- * EEXIST
- * namei:???
- * vnode_authorize:???
- * vn_create:???
+ * Delete a name from the filesystem using Carbon semantics.
*/
-/* ARGSUSED */
-static int
-mkdir1(vfs_context_t ctx, user_addr_t path, struct vnode_attr *vap)
+int
+delete(__unused proc_t p, struct delete_args *uap, __unused int32_t *retval)
{
- vnode_t vp, dvp;
- int error;
- int update_flags = 0;
- struct nameidata nd;
-
- AUDIT_ARG(mode, vap->va_mode);
- NDINIT(&nd, CREATE, LOCKPARENT | AUDITVNPATH1,
- UIO_USERSPACE, path, ctx);
- nd.ni_cnd.cn_flags |= WILLBEDIR;
- error = namei(&nd);
- if (error)
- return (error);
- dvp = nd.ni_dvp;
- vp = nd.ni_vp;
-
- if (vp != NULL) {
- error = EEXIST;
- goto out;
- }
-
- VATTR_SET(vap, va_type, VDIR);
-
-#if CONFIG_MACF
- error = mac_vnode_check_create(ctx,
- nd.ni_dvp, &nd.ni_cnd, vap);
- if (error)
- goto out;
-#endif
-
- /* authorize addition of a directory to the parent */
- if ((error = vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_SUBDIRECTORY, ctx)) != 0)
- goto out;
-
-
- /* make the directory */
- if ((error = vn_create(dvp, &vp, &nd.ni_cnd, vap, 0, ctx)) != 0)
- goto out;
-
- // Make sure the name & parent pointers are hooked up
- if (vp->v_name == NULL)
- update_flags |= VNODE_UPDATE_NAME;
- if (vp->v_parent == NULLVP)
- update_flags |= VNODE_UPDATE_PARENT;
-
- if (update_flags)
- vnode_update_identity(vp, dvp, nd.ni_cnd.cn_nameptr, nd.ni_cnd.cn_namelen, nd.ni_cnd.cn_hash, update_flags);
-
-#if CONFIG_FSE
- add_fsevent(FSE_CREATE_DIR, ctx, FSE_ARG_VNODE, vp, FSE_ARG_DONE);
-#endif
-
-out:
- /*
- * nameidone has to happen before we vnode_put(dvp)
- * since it may need to release the fs_nodelock on the dvp
- */
- nameidone(&nd);
-
- if (vp)
- vnode_put(vp);
- vnode_put(dvp);
-
- return (error);
+ return unlinkat_internal(vfs_context_current(), AT_FDCWD, NULLVP,
+ uap->path, UIO_USERSPACE, VNODE_REMOVE_NODELETEBUSY);
}
-
+/*
+ * Delete a name from the filesystem using POSIX semantics.
+ */
int
-mkdir_extended(proc_t p, struct mkdir_extended_args *uap, __unused register_t *retval)
+unlink(__unused proc_t p, struct unlink_args *uap, __unused int32_t *retval)
{
- int ciferror;
- kauth_filesec_t xsecdst;
- struct vnode_attr va;
-
- xsecdst = NULL;
- if ((uap->xsecurity != USER_ADDR_NULL) &&
- ((ciferror = kauth_copyinfilesec(uap->xsecurity, &xsecdst)) != 0))
- return ciferror;
-
- VATTR_INIT(&va);
- VATTR_SET(&va, va_mode, (uap->mode & ACCESSPERMS) & ~p->p_fd->fd_cmask);
- if (xsecdst != NULL)
- VATTR_SET(&va, va_acl, &xsecdst->fsec_acl);
-
- ciferror = mkdir1(vfs_context_current(), uap->path, &va);
- if (xsecdst != NULL)
- kauth_filesec_free(xsecdst);
- return ciferror;
+ return unlinkat_internal(vfs_context_current(), AT_FDCWD, NULLVP,
+ uap->path, UIO_USERSPACE, 0);
}
int
-mkdir(proc_t p, struct mkdir_args *uap, __unused register_t *retval)
+unlinkat(__unused proc_t p, struct unlinkat_args *uap, __unused int32_t *retval)
{
- struct vnode_attr va;
+ if (uap->flag & ~(AT_REMOVEDIR | AT_REMOVEDIR_DATALESS)) {
+ return EINVAL;
+ }
- VATTR_INIT(&va);
- VATTR_SET(&va, va_mode, (uap->mode & ACCESSPERMS) & ~p->p_fd->fd_cmask);
+ if (uap->flag & (AT_REMOVEDIR | AT_REMOVEDIR_DATALESS)) {
+ int unlink_flags = 0;
- return(mkdir1(vfs_context_current(), uap->path, &va));
+ if (uap->flag & AT_REMOVEDIR_DATALESS) {
+ unlink_flags |= VNODE_REMOVE_DATALESS_DIR;
+ }
+ return rmdirat_internal(vfs_context_current(), uap->fd,
+ uap->path, UIO_USERSPACE, unlink_flags);
+ } else {
+ return unlinkat_internal(vfs_context_current(), uap->fd,
+ NULLVP, uap->path, UIO_USERSPACE, 0);
+ }
}
/*
- * Remove a directory file.
+ * Reposition read/write file offset.
*/
-/* ARGSUSED */
int
-rmdir(__unused proc_t p, struct rmdir_args *uap, __unused register_t *retval)
+lseek(proc_t p, struct lseek_args *uap, off_t *retval)
{
- vnode_t vp, dvp;
+ struct fileproc *fp;
+ vnode_t vp;
+ struct vfs_context *ctx;
+ off_t offset = uap->offset, file_size;
int error;
- struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
-
- int restart_flag, oldvp_id = -1;
-
- /*
- * This loop exists to restart rmdir in the unlikely case that two
- * processes are simultaneously trying to remove the same directory
- * containing orphaned appleDouble files.
- */
- do {
- restart_flag = 0;
-
- NDINIT(&nd, DELETE, LOCKPARENT | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- error = namei(&nd);
- if (error)
- return (error);
- dvp = nd.ni_dvp;
- vp = nd.ni_vp;
-
-
- /*
- * If being restarted check if the new vp
- * still has the same v_id.
- */
- if (oldvp_id != -1 && oldvp_id != vp->v_id) {
- error = ENOENT;
- goto out;
+ if ((error = fp_getfvp(p, uap->fd, &fp, &vp))) {
+ if (error == ENOTSUP) {
+ return ESPIPE;
}
+ return error;
+ }
+ if (vnode_isfifo(vp)) {
+ file_drop(uap->fd);
+ return ESPIPE;
+ }
- if (vp->v_type != VDIR) {
- /*
- * rmdir only deals with directories
- */
- error = ENOTDIR;
- } else if (dvp == vp) {
- /*
- * No rmdir "." please.
- */
- error = EINVAL;
- } else if (vp->v_flag & VROOT) {
- /*
- * The root of a mounted filesystem cannot be deleted.
- */
- error = EBUSY;
- } else {
-#if CONFIG_MACF
- error = mac_vnode_check_unlink(ctx, dvp,
- vp, &nd.ni_cnd);
- if (!error)
-#endif
- error = vnode_authorize(vp, nd.ni_dvp, KAUTH_VNODE_DELETE, ctx);
- }
- if (!error) {
- char *path = NULL;
- int len;
- fse_info finfo;
- int has_listeners = 0;
- int need_event = 0;
-#if CONFIG_FSE
- need_event = need_fsevent(FSE_DELETE, dvp);
- if (need_event) {
- get_fse_info(vp, &finfo, ctx);
- }
+ ctx = vfs_context_current();
+#if CONFIG_MACF
+ if (uap->whence == L_INCR && uap->offset == 0) {
+ error = mac_file_check_get_offset(vfs_context_ucred(ctx),
+ fp->fp_glob);
+ } else {
+ error = mac_file_check_change_offset(vfs_context_ucred(ctx),
+ fp->fp_glob);
+ }
+ if (error) {
+ file_drop(uap->fd);
+ return error;
+ }
#endif
- has_listeners = kauth_authorize_fileop_has_listeners();
- if (need_event || has_listeners) {
- GET_PATH(path);
- if (path == NULL) {
- error = ENOMEM;
- goto out;
- }
- len = MAXPATHLEN;
- vn_getpath(vp, path, &len);
- }
-
- error = VNOP_RMDIR(dvp, vp, &nd.ni_cnd, ctx);
+ if ((error = vnode_getwithref(vp))) {
+ file_drop(uap->fd);
+ return error;
+ }
+ switch (uap->whence) {
+ case L_INCR:
+ offset += fp->fp_glob->fg_offset;
+ break;
+ case L_XTND:
+ if ((error = vnode_size(vp, &file_size, ctx)) != 0) {
+ break;
+ }
+ offset += file_size;
+ break;
+ case L_SET:
+ break;
+ case SEEK_HOLE:
+ error = VNOP_IOCTL(vp, FSIOC_FIOSEEKHOLE, (caddr_t)&offset, 0, ctx);
+ break;
+ case SEEK_DATA:
+ error = VNOP_IOCTL(vp, FSIOC_FIOSEEKDATA, (caddr_t)&offset, 0, ctx);
+ break;
+ default:
+ error = EINVAL;
+ }
+ if (error == 0) {
+ if (uap->offset > 0 && offset < 0) {
+ /* Incremented/relative move past max size */
+ error = EOVERFLOW;
+ } else {
/*
- * Special case to remove orphaned AppleDouble
- * files. I don't like putting this in the kernel,
- * but carbon does not like putting this in carbon either,
- * so here we are.
+ * Allow negative offsets on character devices, per
+ * POSIX 1003.1-2001. Most likely for writing disk
+ * labels.
*/
- if (error == ENOTEMPTY) {
- error = rmdir_remove_orphaned_appleDouble(vp, ctx, &restart_flag);
- if (error == EBUSY) {
- oldvp_id = vp->v_id;
- goto out;
- }
-
-
- /*
- * Assuming everything went well, we will try the RMDIR again
- */
- if (!error)
- error = VNOP_RMDIR(dvp, vp, &nd.ni_cnd, ctx);
+ if (offset < 0 && vp->v_type != VCHR) {
+ /* Decremented/relative move before start */
+ error = EINVAL;
+ } else {
+ /* Success */
+ fp->fp_glob->fg_offset = offset;
+ *retval = fp->fp_glob->fg_offset;
}
+ }
+ }
- /*
- * Call out to allow 3rd party notification of delete.
- * Ignore result of kauth_authorize_fileop call.
- */
- if (!error) {
- if (has_listeners) {
- kauth_authorize_fileop(vfs_context_ucred(ctx),
- KAUTH_FILEOP_DELETE,
- (uintptr_t)vp,
- (uintptr_t)path);
- }
+ /*
+ * An lseek can affect whether data is "available to read." Use
+ * hint of NOTE_NONE so no EVFILT_VNODE events fire
+ */
+ post_event_if_success(vp, error, NOTE_NONE);
+ (void)vnode_put(vp);
+ file_drop(uap->fd);
+ return error;
+}
- if (vp->v_flag & VISHARDLINK) {
- // see the comment in unlink1() about why we update
- // the parent of a hard link when it is removed
- vnode_update_identity(vp, NULL, NULL, 0, 0, VNODE_UPDATE_PARENT);
- }
-#if CONFIG_FSE
- if (need_event) {
- add_fsevent(FSE_DELETE, ctx,
- FSE_ARG_STRING, len, path,
- FSE_ARG_FINFO, &finfo,
- FSE_ARG_DONE);
- }
-#endif
+/*
+ * Check access permissions.
+ *
+ * Returns: 0 Success
+ * vnode_authorize:???
+ */
+static int
+access1(vnode_t vp, vnode_t dvp, int uflags, vfs_context_t ctx)
+{
+ kauth_action_t action;
+ int error;
+
+ /*
+ * If just the regular access bits, convert them to something
+ * that vnode_authorize will understand.
+ */
+ if (!(uflags & _ACCESS_EXTENDED_MASK)) {
+ action = 0;
+ if (uflags & R_OK) {
+ action |= KAUTH_VNODE_READ_DATA; /* aka KAUTH_VNODE_LIST_DIRECTORY */
+ }
+ if (uflags & W_OK) {
+ if (vnode_isdir(vp)) {
+ action |= KAUTH_VNODE_ADD_FILE |
+ KAUTH_VNODE_ADD_SUBDIRECTORY;
+ /* might want delete rights here too */
+ } else {
+ action |= KAUTH_VNODE_WRITE_DATA;
}
- if (path != NULL)
- RELEASE_PATH(path);
}
-
-out:
- /*
- * nameidone has to happen before we vnode_put(dvp)
- * since it may need to release the fs_nodelock on the dvp
- */
- nameidone(&nd);
-
- vnode_put(dvp);
- vnode_put(vp);
-
- if (restart_flag == 0) {
- wakeup_one((caddr_t)vp);
- return (error);
+ if (uflags & X_OK) {
+ if (vnode_isdir(vp)) {
+ action |= KAUTH_VNODE_SEARCH;
+ } else {
+ action |= KAUTH_VNODE_EXECUTE;
+ }
}
- tsleep(vp, PVFS, "rm AD", 1);
+ } else {
+ /* take advantage of definition of uflags */
+ action = uflags >> 8;
+ }
- } while (restart_flag != 0);
+#if CONFIG_MACF
+ error = mac_vnode_check_access(ctx, vp, uflags);
+ if (error) {
+ return error;
+ }
+#endif /* MAC */
- return (error);
+ /* action == 0 means only check for existence */
+ if (action != 0) {
+ error = vnode_authorize(vp, dvp, action | KAUTH_VNODE_ACCESS, ctx);
+ } else {
+ error = 0;
+ }
+ return error;
}
-/* Get direntry length padded to 8 byte alignment */
-#define DIRENT64_LEN(namlen) \
- ((sizeof(struct direntry) + (namlen) - (MAXPATHLEN-1) + 7) & ~7)
-
-static errno_t
-vnode_readdir64(struct vnode *vp, struct uio *uio, int flags, int *eofflag,
- int *numdirent, vfs_context_t ctxp)
-{
- /* Check if fs natively supports VNODE_READDIR_EXTENDED */
- if (vp->v_mount->mnt_vtable->vfc_vfsflags & VFC_VFSREADDIR_EXTENDED) {
- return VNOP_READDIR(vp, uio, flags, eofflag, numdirent, ctxp);
- } else {
- size_t bufsize;
- void * bufptr;
- uio_t auio;
- struct direntry entry64;
- struct dirent *dep;
- int bytesread;
- int error;
-
- /*
- * Our kernel buffer needs to be smaller since re-packing
- * will expand each dirent. The worse case (when the name
- * length is 3) corresponds to a struct direntry size of 32
- * bytes (8-byte aligned) and a struct dirent size of 12 bytes
- * (4-byte aligned). So having a buffer that is 3/8 the size
- * will prevent us from reading more than we can pack.
- *
- * Since this buffer is wired memory, we will limit the
- * buffer size to a maximum of 32K. We would really like to
- * use 32K in the MIN(), but we use magic number 87371 to
- * prevent uio_resid() * 3 / 8 from overflowing.
- */
- bufsize = 3 * MIN(uio_resid(uio), 87371) / 8;
- MALLOC(bufptr, void *, bufsize, M_TEMP, M_WAITOK);
- auio = uio_create(1, 0, UIO_SYSSPACE32, UIO_READ);
- uio_addiov(auio, (uintptr_t)bufptr, bufsize);
- auio->uio_offset = uio->uio_offset;
+
+/*
+ * access_extended: Check access permissions in bulk.
+ *
+ * Description: uap->entries Pointer to an array of accessx
+ * descriptor structs, plus one or
+ * more NULL terminated strings (see
+ * "Notes" section below).
+ * uap->size Size of the area pointed to by
+ * uap->entries.
+ * uap->results Pointer to the results array.
+ *
+ * Returns: 0 Success
+ * ENOMEM Insufficient memory
+ * EINVAL Invalid arguments
+ * namei:EFAULT Bad address
+ * namei:ENAMETOOLONG Filename too long
+ * namei:ENOENT No such file or directory
+ * namei:ELOOP Too many levels of symbolic links
+ * namei:EBADF Bad file descriptor
+ * namei:ENOTDIR Not a directory
+ * namei:???
+ * access1:
+ *
+ * Implicit returns:
+ * uap->results Array contents modified
+ *
+ * Notes: The uap->entries are structured as an arbitrary length array
+ * of accessx descriptors, followed by one or more NULL terminated
+ * strings
+ *
+ * struct accessx_descriptor[0]
+ * ...
+ * struct accessx_descriptor[n]
+ * char name_data[0];
+ *
+ * We determine the entry count by walking the buffer containing
+ * the uap->entries argument descriptor. For each descriptor we
+ * see, the valid values for the offset ad_name_offset will be
+ * in the byte range:
+ *
+ * [ uap->entries + sizeof(struct accessx_descriptor) ]
+ * to
+ * [ uap->entries + uap->size - 2 ]
+ *
+ * since we must have at least one string, and the string must
+ * be at least one character plus the NULL terminator in length.
+ *
+ * XXX: Need to support the check-as uid argument
+ */
+int
+access_extended(__unused proc_t p, struct access_extended_args *uap, __unused int32_t *retval)
+{
+ struct accessx_descriptor *input = NULL;
+ errno_t *result = NULL;
+ errno_t error = 0;
+ int wantdelete = 0;
+ size_t desc_max, desc_actual;
+ unsigned int i, j;
+ struct vfs_context context;
+ struct nameidata nd;
+ int niopts;
+ vnode_t vp = NULL;
+ vnode_t dvp = NULL;
+#define ACCESSX_MAX_DESCR_ON_STACK 10
+ struct accessx_descriptor stack_input[ACCESSX_MAX_DESCR_ON_STACK];
+
+ context.vc_ucred = NULL;
+
+ /*
+ * Validate parameters; if valid, copy the descriptor array and string
+ * arguments into local memory. Before proceeding, the following
+ * conditions must have been met:
+ *
+ * o The total size is not permitted to exceed ACCESSX_MAX_TABLESIZE
+ * o There must be sufficient room in the request for at least one
+ * descriptor and a one yte NUL terminated string.
+ * o The allocation of local storage must not fail.
+ */
+ if (uap->size > ACCESSX_MAX_TABLESIZE) {
+ return ENOMEM;
+ }
+ if (uap->size < (sizeof(struct accessx_descriptor) + 2)) {
+ return EINVAL;
+ }
+ if (uap->size <= sizeof(stack_input)) {
+ input = stack_input;
+ } else {
+ input = kheap_alloc(KHEAP_DATA_BUFFERS, uap->size, Z_WAITOK);
+ if (input == NULL) {
+ error = ENOMEM;
+ goto out;
+ }
+ }
+ error = copyin(uap->entries, input, uap->size);
+ if (error) {
+ goto out;
+ }
+
+ AUDIT_ARG(opaque, input, uap->size);
+
+ /*
+ * Force NUL termination of the copyin buffer to avoid nami() running
+ * off the end. If the caller passes us bogus data, they may get a
+ * bogus result.
+ */
+ ((char *)input)[uap->size - 1] = 0;
+
+ /*
+ * Access is defined as checking against the process' real identity,
+ * even if operations are checking the effective identity. This
+ * requires that we use a local vfs context.
+ */
+ context.vc_ucred = kauth_cred_copy_real(kauth_cred_get());
+ context.vc_thread = current_thread();
+
+ /*
+ * Find out how many entries we have, so we can allocate the result
+ * array by walking the list and adjusting the count downward by the
+ * earliest string offset we see.
+ */
+ desc_max = (uap->size - 2) / sizeof(struct accessx_descriptor);
+ desc_actual = desc_max;
+ for (i = 0; i < desc_actual; i++) {
+ /*
+ * Take the offset to the name string for this entry and
+ * convert to an input array index, which would be one off
+ * the end of the array if this entry was the lowest-addressed
+ * name string.
+ */
+ j = input[i].ad_name_offset / sizeof(struct accessx_descriptor);
+
+ /*
+ * An offset greater than the max allowable offset is an error.
+ * It is also an error for any valid entry to point
+ * to a location prior to the end of the current entry, if
+ * it's not a reference to the string of the previous entry.
+ */
+ if (j > desc_max || (j != 0 && j <= i)) {
+ error = EINVAL;
+ goto out;
+ }
+
+ /* Also do not let ad_name_offset point to something beyond the size of the input */
+ if (input[i].ad_name_offset >= uap->size) {
+ error = EINVAL;
+ goto out;
+ }
+
+ /*
+ * An offset of 0 means use the previous descriptor's offset;
+ * this is used to chain multiple requests for the same file
+ * to avoid multiple lookups.
+ */
+ if (j == 0) {
+ /* This is not valid for the first entry */
+ if (i == 0) {
+ error = EINVAL;
+ goto out;
+ }
+ continue;
+ }
+
+ /*
+ * If the offset of the string for this descriptor is before
+ * what we believe is the current actual last descriptor,
+ * then we need to adjust our estimate downward; this permits
+ * the string table following the last descriptor to be out
+ * of order relative to the descriptor list.
+ */
+ if (j < desc_actual) {
+ desc_actual = j;
+ }
+ }
+
+ /*
+ * We limit the actual number of descriptors we are willing to process
+ * to a hard maximum of ACCESSX_MAX_DESCRIPTORS. If the number being
+ * requested does not exceed this limit,
+ */
+ if (desc_actual > ACCESSX_MAX_DESCRIPTORS) {
+ error = ENOMEM;
+ goto out;
+ }
+ result = kheap_alloc(KHEAP_DATA_BUFFERS, desc_actual * sizeof(errno_t),
+ Z_WAITOK | Z_ZERO);
+ if (result == NULL) {
+ error = ENOMEM;
+ goto out;
+ }
+
+ /*
+ * Do the work by iterating over the descriptor entries we know to
+ * at least appear to contain valid data.
+ */
+ error = 0;
+ for (i = 0; i < desc_actual; i++) {
+ /*
+ * If the ad_name_offset is 0, then we use the previous
+ * results to make the check; otherwise, we are looking up
+ * a new file name.
+ */
+ if (input[i].ad_name_offset != 0) {
+ /* discard old vnodes */
+ if (vp) {
+ vnode_put(vp);
+ vp = NULL;
+ }
+ if (dvp) {
+ vnode_put(dvp);
+ dvp = NULL;
+ }
+
+ /*
+ * Scan forward in the descriptor list to see if we
+ * need the parent vnode. We will need it if we are
+ * deleting, since we must have rights to remove
+ * entries in the parent directory, as well as the
+ * rights to delete the object itself.
+ */
+ wantdelete = input[i].ad_flags & _DELETE_OK;
+ for (j = i + 1; (j < desc_actual) && (input[j].ad_name_offset == 0); j++) {
+ if (input[j].ad_flags & _DELETE_OK) {
+ wantdelete = 1;
+ }
+ }
+
+ niopts = FOLLOW | AUDITVNPATH1;
+
+ /* need parent for vnode_authorize for deletion test */
+ if (wantdelete) {
+ niopts |= WANTPARENT;
+ }
+
+ /* do the lookup */
+ NDINIT(&nd, LOOKUP, OP_ACCESS, niopts, UIO_SYSSPACE,
+ CAST_USER_ADDR_T(((const char *)input) + input[i].ad_name_offset),
+ &context);
+ error = namei(&nd);
+ if (!error) {
+ vp = nd.ni_vp;
+ if (wantdelete) {
+ dvp = nd.ni_dvp;
+ }
+ }
+ nameidone(&nd);
+ }
+
+ /*
+ * Handle lookup errors.
+ */
+ switch (error) {
+ case ENOENT:
+ case EACCES:
+ case EPERM:
+ case ENOTDIR:
+ result[i] = error;
+ break;
+ case 0:
+ /* run this access check */
+ result[i] = access1(vp, dvp, input[i].ad_flags, &context);
+ break;
+ default:
+ /* fatal lookup error */
+
+ goto out;
+ }
+ }
+
+ AUDIT_ARG(data, result, sizeof(errno_t), desc_actual);
+
+ /* copy out results */
+ error = copyout(result, uap->results, desc_actual * sizeof(errno_t));
+
+out:
+ if (input && input != stack_input) {
+ kheap_free(KHEAP_DATA_BUFFERS, input, uap->size);
+ }
+ if (result) {
+ kheap_free(KHEAP_DATA_BUFFERS, result, desc_actual * sizeof(errno_t));
+ }
+ if (vp) {
+ vnode_put(vp);
+ }
+ if (dvp) {
+ vnode_put(dvp);
+ }
+ if (IS_VALID_CRED(context.vc_ucred)) {
+ kauth_cred_unref(&context.vc_ucred);
+ }
+ return error;
+}
+
+
+/*
+ * Returns: 0 Success
+ * namei:EFAULT Bad address
+ * namei:ENAMETOOLONG Filename too long
+ * namei:ENOENT No such file or directory
+ * namei:ELOOP Too many levels of symbolic links
+ * namei:EBADF Bad file descriptor
+ * namei:ENOTDIR Not a directory
+ * namei:???
+ * access1:
+ */
+static int
+faccessat_internal(vfs_context_t ctx, int fd, user_addr_t path, int amode,
+ int flag, enum uio_seg segflg)
+{
+ int error;
+ struct nameidata nd;
+ int niopts;
+ struct vfs_context context;
+#if NAMEDRSRCFORK
+ int is_namedstream = 0;
+#endif
+
+ /*
+ * Unless the AT_EACCESS option is used, Access is defined as checking
+ * against the process' real identity, even if operations are checking
+ * the effective identity. So we need to tweak the credential
+ * in the context for that case.
+ */
+ if (!(flag & AT_EACCESS)) {
+ context.vc_ucred = kauth_cred_copy_real(kauth_cred_get());
+ } else {
+ context.vc_ucred = ctx->vc_ucred;
+ }
+ context.vc_thread = ctx->vc_thread;
+
+
+ niopts = (flag & AT_SYMLINK_NOFOLLOW ? NOFOLLOW : FOLLOW) | AUDITVNPATH1;
+ /* need parent for vnode_authorize for deletion test */
+ if (amode & _DELETE_OK) {
+ niopts |= WANTPARENT;
+ }
+ NDINIT(&nd, LOOKUP, OP_ACCESS, niopts, segflg,
+ path, &context);
+
+#if NAMEDRSRCFORK
+ /* access(F_OK) calls are allowed for resource forks. */
+ if (amode == F_OK) {
+ nd.ni_cnd.cn_flags |= CN_ALLOWRSRCFORK;
+ }
+#endif
+ error = nameiat(&nd, fd);
+ if (error) {
+ goto out;
+ }
+
+#if NAMEDRSRCFORK
+ /* Grab reference on the shadow stream file vnode to
+ * force an inactive on release which will mark it
+ * for recycle.
+ */
+ if (vnode_isnamedstream(nd.ni_vp) &&
+ (nd.ni_vp->v_parent != NULLVP) &&
+ vnode_isshadow(nd.ni_vp)) {
+ is_namedstream = 1;
+ vnode_ref(nd.ni_vp);
+ }
+#endif
+
+ error = access1(nd.ni_vp, nd.ni_dvp, amode, &context);
+
+#if NAMEDRSRCFORK
+ if (is_namedstream) {
+ vnode_rele(nd.ni_vp);
+ }
+#endif
+
+ vnode_put(nd.ni_vp);
+ if (amode & _DELETE_OK) {
+ vnode_put(nd.ni_dvp);
+ }
+ nameidone(&nd);
+
+out:
+ if (!(flag & AT_EACCESS)) {
+ kauth_cred_unref(&context.vc_ucred);
+ }
+ return error;
+}
+
+int
+access(__unused proc_t p, struct access_args *uap, __unused int32_t *retval)
+{
+ return faccessat_internal(vfs_context_current(), AT_FDCWD,
+ uap->path, uap->flags, 0, UIO_USERSPACE);
+}
+
+int
+faccessat(__unused proc_t p, struct faccessat_args *uap,
+ __unused int32_t *retval)
+{
+ if (uap->flag & ~(AT_EACCESS | AT_SYMLINK_NOFOLLOW)) {
+ return EINVAL;
+ }
+
+ return faccessat_internal(vfs_context_current(), uap->fd,
+ uap->path, uap->amode, uap->flag, UIO_USERSPACE);
+}
+
+/*
+ * Returns: 0 Success
+ * EFAULT
+ * copyout:EFAULT
+ * namei:???
+ * vn_stat:???
+ */
+static int
+fstatat_internal(vfs_context_t ctx, user_addr_t path, user_addr_t ub,
+ user_addr_t xsecurity, user_addr_t xsecurity_size, int isstat64,
+ enum uio_seg segflg, int fd, int flag)
+{
+ struct nameidata nd;
+ int follow;
+ union {
+ struct stat sb;
+ struct stat64 sb64;
+ } source = {};
+ union {
+ struct user64_stat user64_sb;
+ struct user32_stat user32_sb;
+ struct user64_stat64 user64_sb64;
+ struct user32_stat64 user32_sb64;
+ } dest = {};
+ caddr_t sbp;
+ int error, my_size;
+ kauth_filesec_t fsec;
+ size_t xsecurity_bufsize;
+ void * statptr;
+ struct fileproc *fp = NULL;
+ int needsrealdev = 0;
+
+ follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
+ NDINIT(&nd, LOOKUP, OP_GETATTR, follow | AUDITVNPATH1,
+ segflg, path, ctx);
+
+#if NAMEDRSRCFORK
+ int is_namedstream = 0;
+ /* stat calls are allowed for resource forks. */
+ nd.ni_cnd.cn_flags |= CN_ALLOWRSRCFORK;
+#endif
+
+ if (flag & AT_FDONLY) {
+ vnode_t fvp;
+
+ error = fp_getfvp(vfs_context_proc(ctx), fd, &fp, &fvp);
+ if (error) {
+ return error;
+ }
+ if ((error = vnode_getwithref(fvp))) {
+ file_drop(fd);
+ return error;
+ }
+ nd.ni_vp = fvp;
+ } else {
+ error = nameiat(&nd, fd);
+ if (error) {
+ return error;
+ }
+ }
+ fsec = KAUTH_FILESEC_NONE;
+
+ statptr = (void *)&source;
+
+#if NAMEDRSRCFORK
+ /* Grab reference on the shadow stream file vnode to
+ * force an inactive on release which will mark it
+ * for recycle.
+ */
+ if (vnode_isnamedstream(nd.ni_vp) &&
+ (nd.ni_vp->v_parent != NULLVP) &&
+ vnode_isshadow(nd.ni_vp)) {
+ is_namedstream = 1;
+ vnode_ref(nd.ni_vp);
+ }
+#endif
+
+ needsrealdev = flag & AT_REALDEV ? 1 : 0;
+ if (fp && (xsecurity == USER_ADDR_NULL)) {
+ /*
+ * If the caller has the file open, and is not
+ * requesting extended security information, we are
+ * going to let them get the basic stat information.
+ */
+ error = vn_stat_noauth(nd.ni_vp, statptr, NULL, isstat64, needsrealdev, ctx,
+ fp->fp_glob->fg_cred);
+ } else {
+ error = vn_stat(nd.ni_vp, statptr, (xsecurity != USER_ADDR_NULL ? &fsec : NULL),
+ isstat64, needsrealdev, ctx);
+ }
+
+#if NAMEDRSRCFORK
+ if (is_namedstream) {
+ vnode_rele(nd.ni_vp);
+ }
+#endif
+ vnode_put(nd.ni_vp);
+ nameidone(&nd);
+ if (fp) {
+ file_drop(fd);
+ fp = NULL;
+ }
+
+ if (error) {
+ return error;
+ }
+ /* Zap spare fields */
+ if (isstat64 != 0) {
+ source.sb64.st_lspare = 0;
+ source.sb64.st_qspare[0] = 0LL;
+ source.sb64.st_qspare[1] = 0LL;
+ if (IS_64BIT_PROCESS(vfs_context_proc(ctx))) {
+ munge_user64_stat64(&source.sb64, &dest.user64_sb64);
+ my_size = sizeof(dest.user64_sb64);
+ sbp = (caddr_t)&dest.user64_sb64;
+ } else {
+ munge_user32_stat64(&source.sb64, &dest.user32_sb64);
+ my_size = sizeof(dest.user32_sb64);
+ sbp = (caddr_t)&dest.user32_sb64;
+ }
+ /*
+ * Check if we raced (post lookup) against the last unlink of a file.
+ */
+ if ((source.sb64.st_nlink == 0) && S_ISREG(source.sb64.st_mode)) {
+ source.sb64.st_nlink = 1;
+ }
+ } else {
+ source.sb.st_lspare = 0;
+ source.sb.st_qspare[0] = 0LL;
+ source.sb.st_qspare[1] = 0LL;
+ if (IS_64BIT_PROCESS(vfs_context_proc(ctx))) {
+ munge_user64_stat(&source.sb, &dest.user64_sb);
+ my_size = sizeof(dest.user64_sb);
+ sbp = (caddr_t)&dest.user64_sb;
+ } else {
+ munge_user32_stat(&source.sb, &dest.user32_sb);
+ my_size = sizeof(dest.user32_sb);
+ sbp = (caddr_t)&dest.user32_sb;
+ }
+
+ /*
+ * Check if we raced (post lookup) against the last unlink of a file.
+ */
+ if ((source.sb.st_nlink == 0) && S_ISREG(source.sb.st_mode)) {
+ source.sb.st_nlink = 1;
+ }
+ }
+ if ((error = copyout(sbp, ub, my_size)) != 0) {
+ goto out;
+ }
+
+ /* caller wants extended security information? */
+ if (xsecurity != USER_ADDR_NULL) {
+ /* did we get any? */
+ if (fsec == KAUTH_FILESEC_NONE) {
+ if (susize(xsecurity_size, 0) != 0) {
+ error = EFAULT;
+ goto out;
+ }
+ } else {
+ /* find the user buffer size */
+ xsecurity_bufsize = fusize(xsecurity_size);
+
+ /* copy out the actual data size */
+ if (susize(xsecurity_size, KAUTH_FILESEC_COPYSIZE(fsec)) != 0) {
+ error = EFAULT;
+ goto out;
+ }
+
+ /* if the caller supplied enough room, copy out to it */
+ if (xsecurity_bufsize >= KAUTH_FILESEC_COPYSIZE(fsec)) {
+ error = copyout(fsec, xsecurity, KAUTH_FILESEC_COPYSIZE(fsec));
+ }
+ }
+ }
+out:
+ if (fsec != KAUTH_FILESEC_NONE) {
+ kauth_filesec_free(fsec);
+ }
+ return error;
+}
+
+/*
+ * stat_extended: Get file status; with extended security (ACL).
+ *
+ * Parameters: p (ignored)
+ * uap User argument descriptor (see below)
+ * retval (ignored)
+ *
+ * Indirect: uap->path Path of file to get status from
+ * uap->ub User buffer (holds file status info)
+ * uap->xsecurity ACL to get (extended security)
+ * uap->xsecurity_size Size of ACL
+ *
+ * Returns: 0 Success
+ * !0 errno value
+ *
+ */
+int
+stat_extended(__unused proc_t p, struct stat_extended_args *uap,
+ __unused int32_t *retval)
+{
+ return fstatat_internal(vfs_context_current(), uap->path, uap->ub,
+ uap->xsecurity, uap->xsecurity_size, 0, UIO_USERSPACE, AT_FDCWD,
+ 0);
+}
+
+/*
+ * Returns: 0 Success
+ * fstatat_internal:??? [see fstatat_internal() in this file]
+ */
+int
+stat(__unused proc_t p, struct stat_args *uap, __unused int32_t *retval)
+{
+ return fstatat_internal(vfs_context_current(), uap->path, uap->ub,
+ 0, 0, 0, UIO_USERSPACE, AT_FDCWD, 0);
+}
+
+int
+stat64(__unused proc_t p, struct stat64_args *uap, __unused int32_t *retval)
+{
+ return fstatat_internal(vfs_context_current(), uap->path, uap->ub,
+ 0, 0, 1, UIO_USERSPACE, AT_FDCWD, 0);
+}
+
+/*
+ * stat64_extended: Get file status; can handle large inode numbers; with extended security (ACL).
+ *
+ * Parameters: p (ignored)
+ * uap User argument descriptor (see below)
+ * retval (ignored)
+ *
+ * Indirect: uap->path Path of file to get status from
+ * uap->ub User buffer (holds file status info)
+ * uap->xsecurity ACL to get (extended security)
+ * uap->xsecurity_size Size of ACL
+ *
+ * Returns: 0 Success
+ * !0 errno value
+ *
+ */
+int
+stat64_extended(__unused proc_t p, struct stat64_extended_args *uap, __unused int32_t *retval)
+{
+ return fstatat_internal(vfs_context_current(), uap->path, uap->ub,
+ uap->xsecurity, uap->xsecurity_size, 1, UIO_USERSPACE, AT_FDCWD,
+ 0);
+}
+
+/*
+ * lstat_extended: Get file status; does not follow links; with extended security (ACL).
+ *
+ * Parameters: p (ignored)
+ * uap User argument descriptor (see below)
+ * retval (ignored)
+ *
+ * Indirect: uap->path Path of file to get status from
+ * uap->ub User buffer (holds file status info)
+ * uap->xsecurity ACL to get (extended security)
+ * uap->xsecurity_size Size of ACL
+ *
+ * Returns: 0 Success
+ * !0 errno value
+ *
+ */
+int
+lstat_extended(__unused proc_t p, struct lstat_extended_args *uap, __unused int32_t *retval)
+{
+ return fstatat_internal(vfs_context_current(), uap->path, uap->ub,
+ uap->xsecurity, uap->xsecurity_size, 0, UIO_USERSPACE, AT_FDCWD,
+ AT_SYMLINK_NOFOLLOW);
+}
+
+/*
+ * Get file status; this version does not follow links.
+ */
+int
+lstat(__unused proc_t p, struct lstat_args *uap, __unused int32_t *retval)
+{
+ return fstatat_internal(vfs_context_current(), uap->path, uap->ub,
+ 0, 0, 0, UIO_USERSPACE, AT_FDCWD, AT_SYMLINK_NOFOLLOW);
+}
+
+int
+lstat64(__unused proc_t p, struct lstat64_args *uap, __unused int32_t *retval)
+{
+ return fstatat_internal(vfs_context_current(), uap->path, uap->ub,
+ 0, 0, 1, UIO_USERSPACE, AT_FDCWD, AT_SYMLINK_NOFOLLOW);
+}
+
+/*
+ * lstat64_extended: Get file status; can handle large inode numbers; does not
+ * follow links; with extended security (ACL).
+ *
+ * Parameters: p (ignored)
+ * uap User argument descriptor (see below)
+ * retval (ignored)
+ *
+ * Indirect: uap->path Path of file to get status from
+ * uap->ub User buffer (holds file status info)
+ * uap->xsecurity ACL to get (extended security)
+ * uap->xsecurity_size Size of ACL
+ *
+ * Returns: 0 Success
+ * !0 errno value
+ *
+ */
+int
+lstat64_extended(__unused proc_t p, struct lstat64_extended_args *uap, __unused int32_t *retval)
+{
+ return fstatat_internal(vfs_context_current(), uap->path, uap->ub,
+ uap->xsecurity, uap->xsecurity_size, 1, UIO_USERSPACE, AT_FDCWD,
+ AT_SYMLINK_NOFOLLOW);
+}
+
+int
+fstatat(__unused proc_t p, struct fstatat_args *uap, __unused int32_t *retval)
+{
+ if (uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_REALDEV | AT_FDONLY)) {
+ return EINVAL;
+ }
+
+ return fstatat_internal(vfs_context_current(), uap->path, uap->ub,
+ 0, 0, 0, UIO_USERSPACE, uap->fd, uap->flag);
+}
+
+int
+fstatat64(__unused proc_t p, struct fstatat64_args *uap,
+ __unused int32_t *retval)
+{
+ if (uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_REALDEV | AT_FDONLY)) {
+ return EINVAL;
+ }
+
+ return fstatat_internal(vfs_context_current(), uap->path, uap->ub,
+ 0, 0, 1, UIO_USERSPACE, uap->fd, uap->flag);
+}
+
+/*
+ * Get configurable pathname variables.
+ *
+ * Returns: 0 Success
+ * namei:???
+ * vn_pathconf:???
+ *
+ * Notes: Global implementation constants are intended to be
+ * implemented in this function directly; all other constants
+ * are per-FS implementation, and therefore must be handled in
+ * each respective FS, instead.
+ *
+ * XXX We implement some things globally right now that should actually be
+ * XXX per-FS; we will need to deal with this at some point.
+ */
+/* ARGSUSED */
+int
+pathconf(__unused proc_t p, struct pathconf_args *uap, int32_t *retval)
+{
+ int error;
+ struct nameidata nd;
+ vfs_context_t ctx = vfs_context_current();
+
+ NDINIT(&nd, LOOKUP, OP_PATHCONF, FOLLOW | AUDITVNPATH1,
+ UIO_USERSPACE, uap->path, ctx);
+ error = namei(&nd);
+ if (error) {
+ return error;
+ }
+
+ error = vn_pathconf(nd.ni_vp, uap->name, retval, ctx);
+
+ vnode_put(nd.ni_vp);
+ nameidone(&nd);
+ return error;
+}
+
+/*
+ * Return target name of a symbolic link.
+ */
+/* ARGSUSED */
+static int
+readlinkat_internal(vfs_context_t ctx, int fd, user_addr_t path,
+ enum uio_seg seg, user_addr_t buf, size_t bufsize, enum uio_seg bufseg,
+ int *retval)
+{
+ vnode_t vp;
+ uio_t auio;
+ int error;
+ struct nameidata nd;
+ char uio_buf[UIO_SIZEOF(1)];
+
+ if (bufsize > INT32_MAX) {
+ return EINVAL;
+ }
+
+ NDINIT(&nd, LOOKUP, OP_READLINK, NOFOLLOW | AUDITVNPATH1,
+ seg, path, ctx);
+
+ error = nameiat(&nd, fd);
+ if (error) {
+ return error;
+ }
+ vp = nd.ni_vp;
+
+ nameidone(&nd);
+
+ auio = uio_createwithbuffer(1, 0, bufseg, UIO_READ,
+ &uio_buf[0], sizeof(uio_buf));
+ uio_addiov(auio, buf, bufsize);
+ if (vp->v_type != VLNK) {
+ error = EINVAL;
+ } else {
+#if CONFIG_MACF
+ error = mac_vnode_check_readlink(ctx, vp);
+#endif
+ if (error == 0) {
+ error = vnode_authorize(vp, NULL, KAUTH_VNODE_READ_DATA,
+ ctx);
+ }
+ if (error == 0) {
+ error = VNOP_READLINK(vp, auio, ctx);
+ }
+ }
+ vnode_put(vp);
+
+ *retval = (int)(bufsize - uio_resid(auio));
+ return error;
+}
+
+int
+readlink(proc_t p, struct readlink_args *uap, int32_t *retval)
+{
+ enum uio_seg procseg;
+
+ procseg = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
+ return readlinkat_internal(vfs_context_current(), AT_FDCWD,
+ CAST_USER_ADDR_T(uap->path), procseg, CAST_USER_ADDR_T(uap->buf),
+ uap->count, procseg, retval);
+}
+
+int
+readlinkat(proc_t p, struct readlinkat_args *uap, int32_t *retval)
+{
+ enum uio_seg procseg;
+
+ procseg = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
+ return readlinkat_internal(vfs_context_current(), uap->fd, uap->path,
+ procseg, uap->buf, uap->bufsize, procseg, retval);
+}
+
+/*
+ * Change file flags, the deep inner layer.
+ */
+static int
+chflags0(vnode_t vp, struct vnode_attr *va,
+ int (*setattr)(vnode_t, void *, vfs_context_t),
+ void *arg, vfs_context_t ctx)
+{
+ kauth_action_t action = 0;
+ int error;
+
+#if CONFIG_MACF
+ error = mac_vnode_check_setflags(ctx, vp, va->va_flags);
+ if (error) {
+ goto out;
+ }
+#endif
+
+ /* request authorisation, disregard immutability */
+ if ((error = vnode_authattr(vp, va, &action, ctx)) != 0) {
+ goto out;
+ }
+ /*
+ * Request that the auth layer disregard those file flags it's allowed to when
+ * authorizing this operation; we need to do this in order to be able to
+ * clear immutable flags.
+ */
+ if (action && ((error = vnode_authorize(vp, NULL, action | KAUTH_VNODE_NOIMMUTABLE, ctx)) != 0)) {
+ goto out;
+ }
+ error = (*setattr)(vp, arg, ctx);
+
+#if CONFIG_MACF
+ if (error == 0) {
+ mac_vnode_notify_setflags(ctx, vp, va->va_flags);
+ }
+#endif
+
+out:
+ return error;
+}
+
+/*
+ * Change file flags.
+ *
+ * NOTE: this will vnode_put() `vp'
+ */
+static int
+chflags1(vnode_t vp, int flags, vfs_context_t ctx)
+{
+ struct vnode_attr va;
+ int error;
+
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_flags, flags);
+
+ error = chflags0(vp, &va, (void *)vnode_setattr, &va, ctx);
+ vnode_put(vp);
+
+ if ((error == 0) && !VATTR_IS_SUPPORTED(&va, va_flags)) {
+ error = ENOTSUP;
+ }
+
+ return error;
+}
+
+/*
+ * Change flags of a file given a path name.
+ */
+/* ARGSUSED */
+int
+chflags(__unused proc_t p, struct chflags_args *uap, __unused int32_t *retval)
+{
+ vnode_t vp;
+ vfs_context_t ctx = vfs_context_current();
+ int error;
+ struct nameidata nd;
+
+ AUDIT_ARG(fflags, uap->flags);
+ NDINIT(&nd, LOOKUP, OP_SETATTR, FOLLOW | AUDITVNPATH1,
+ UIO_USERSPACE, uap->path, ctx);
+ error = namei(&nd);
+ if (error) {
+ return error;
+ }
+ vp = nd.ni_vp;
+ nameidone(&nd);
+
+ /* we don't vnode_put() here because chflags1 does internally */
+ error = chflags1(vp, uap->flags, ctx);
+
+ return error;
+}
+
+/*
+ * Change flags of a file given a file descriptor.
+ */
+/* ARGSUSED */
+int
+fchflags(__unused proc_t p, struct fchflags_args *uap, __unused int32_t *retval)
+{
+ vnode_t vp;
+ int error;
+
+ AUDIT_ARG(fd, uap->fd);
+ AUDIT_ARG(fflags, uap->flags);
+ if ((error = file_vnode(uap->fd, &vp))) {
+ return error;
+ }
+
+ if ((error = vnode_getwithref(vp))) {
+ file_drop(uap->fd);
+ return error;
+ }
+
+ AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+
+ /* we don't vnode_put() here because chflags1 does internally */
+ error = chflags1(vp, uap->flags, vfs_context_current());
+
+ file_drop(uap->fd);
+ return error;
+}
+
+/*
+ * Change security information on a filesystem object.
+ *
+ * Returns: 0 Success
+ * EPERM Operation not permitted
+ * vnode_authattr:??? [anything vnode_authattr can return]
+ * vnode_authorize:??? [anything vnode_authorize can return]
+ * vnode_setattr:??? [anything vnode_setattr can return]
+ *
+ * Notes: If vnode_authattr or vnode_authorize return EACCES, it will be
+ * translated to EPERM before being returned.
+ */
+static int
+chmod_vnode(vfs_context_t ctx, vnode_t vp, struct vnode_attr *vap)
+{
+ kauth_action_t action;
+ int error;
+
+ AUDIT_ARG(mode, vap->va_mode);
+ /* XXX audit new args */
+
+#if NAMEDSTREAMS
+ /* chmod calls are not allowed for resource forks. */
+ if (vp->v_flag & VISNAMEDSTREAM) {
+ return EPERM;
+ }
+#endif
+
+#if CONFIG_MACF
+ if (VATTR_IS_ACTIVE(vap, va_mode) &&
+ (error = mac_vnode_check_setmode(ctx, vp, (mode_t)vap->va_mode)) != 0) {
+ return error;
+ }
+
+ if (VATTR_IS_ACTIVE(vap, va_uid) || VATTR_IS_ACTIVE(vap, va_gid)) {
+ if ((error = mac_vnode_check_setowner(ctx, vp,
+ VATTR_IS_ACTIVE(vap, va_uid) ? vap->va_uid : -1,
+ VATTR_IS_ACTIVE(vap, va_gid) ? vap->va_gid : -1))) {
+ return error;
+ }
+ }
+
+ if (VATTR_IS_ACTIVE(vap, va_acl) &&
+ (error = mac_vnode_check_setacl(ctx, vp, vap->va_acl))) {
+ return error;
+ }
+#endif
+
+ /* make sure that the caller is allowed to set this security information */
+ if (((error = vnode_authattr(vp, vap, &action, ctx)) != 0) ||
+ ((error = vnode_authorize(vp, NULL, action, ctx)) != 0)) {
+ if (error == EACCES) {
+ error = EPERM;
+ }
+ return error;
+ }
+
+ if ((error = vnode_setattr(vp, vap, ctx)) != 0) {
+ return error;
+ }
+
+#if CONFIG_MACF
+ if (VATTR_IS_ACTIVE(vap, va_mode)) {
+ mac_vnode_notify_setmode(ctx, vp, (mode_t)vap->va_mode);
+ }
+
+ if (VATTR_IS_ACTIVE(vap, va_uid) || VATTR_IS_ACTIVE(vap, va_gid)) {
+ mac_vnode_notify_setowner(ctx, vp,
+ VATTR_IS_ACTIVE(vap, va_uid) ? vap->va_uid : -1,
+ VATTR_IS_ACTIVE(vap, va_gid) ? vap->va_gid : -1);
+ }
+
+ if (VATTR_IS_ACTIVE(vap, va_acl)) {
+ mac_vnode_notify_setacl(ctx, vp, vap->va_acl);
+ }
+#endif
+
+ return error;
+}
+
+
+/*
+ * Change mode of a file given a path name.
+ *
+ * Returns: 0 Success
+ * namei:??? [anything namei can return]
+ * chmod_vnode:??? [anything chmod_vnode can return]
+ */
+static int
+chmodat(vfs_context_t ctx, user_addr_t path, struct vnode_attr *vap,
+ int fd, int flag, enum uio_seg segflg)
+{
+ struct nameidata nd;
+ int follow, error;
+
+ follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
+ NDINIT(&nd, LOOKUP, OP_SETATTR, follow | AUDITVNPATH1,
+ segflg, path, ctx);
+ if ((error = nameiat(&nd, fd))) {
+ return error;
+ }
+ error = chmod_vnode(ctx, nd.ni_vp, vap);
+ vnode_put(nd.ni_vp);
+ nameidone(&nd);
+ return error;
+}
+
+/*
+ * chmod_extended: Change the mode of a file given a path name; with extended
+ * argument list (including extended security (ACL)).
+ *
+ * Parameters: p Process requesting the open
+ * uap User argument descriptor (see below)
+ * retval (ignored)
+ *
+ * Indirect: uap->path Path to object (same as 'chmod')
+ * uap->uid UID to set
+ * uap->gid GID to set
+ * uap->mode File mode to set (same as 'chmod')
+ * uap->xsecurity ACL to set (or delete)
+ *
+ * Returns: 0 Success
+ * !0 errno value
+ *
+ * Notes: The kauth_filesec_t in 'va', if any, is in host byte order.
+ *
+ * XXX: We should enummerate the possible errno values here, and where
+ * in the code they originated.
+ */
+int
+chmod_extended(__unused proc_t p, struct chmod_extended_args *uap, __unused int32_t *retval)
+{
+ int error;
+ struct vnode_attr va;
+ kauth_filesec_t xsecdst;
+
+ AUDIT_ARG(owner, uap->uid, uap->gid);
+
+ VATTR_INIT(&va);
+ if (uap->mode != -1) {
+ VATTR_SET(&va, va_mode, uap->mode & ALLPERMS);
+ }
+ if (uap->uid != KAUTH_UID_NONE) {
+ VATTR_SET(&va, va_uid, uap->uid);
+ }
+ if (uap->gid != KAUTH_GID_NONE) {
+ VATTR_SET(&va, va_gid, uap->gid);
+ }
+
+ xsecdst = NULL;
+ switch (uap->xsecurity) {
+ /* explicit remove request */
+ case CAST_USER_ADDR_T((void *)1): /* _FILESEC_REMOVE_ACL */
+ VATTR_SET(&va, va_acl, NULL);
+ break;
+ /* not being set */
+ case USER_ADDR_NULL:
+ break;
+ default:
+ if ((error = kauth_copyinfilesec(uap->xsecurity, &xsecdst)) != 0) {
+ return error;
+ }
+ VATTR_SET(&va, va_acl, &xsecdst->fsec_acl);
+ KAUTH_DEBUG("CHMOD - setting ACL with %d entries", va.va_acl->acl_entrycount);
+ }
+
+ error = chmodat(vfs_context_current(), uap->path, &va, AT_FDCWD, 0,
+ UIO_USERSPACE);
+
+ if (xsecdst != NULL) {
+ kauth_filesec_free(xsecdst);
+ }
+ return error;
+}
+
+/*
+ * Returns: 0 Success
+ * chmodat:??? [anything chmodat can return]
+ */
+static int
+fchmodat_internal(vfs_context_t ctx, user_addr_t path, int mode, int fd,
+ int flag, enum uio_seg segflg)
+{
+ struct vnode_attr va;
+
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_mode, mode & ALLPERMS);
+
+ return chmodat(ctx, path, &va, fd, flag, segflg);
+}
+
+int
+chmod(__unused proc_t p, struct chmod_args *uap, __unused int32_t *retval)
+{
+ return fchmodat_internal(vfs_context_current(), uap->path, uap->mode,
+ AT_FDCWD, 0, UIO_USERSPACE);
+}
+
+int
+fchmodat(__unused proc_t p, struct fchmodat_args *uap, __unused int32_t *retval)
+{
+ if (uap->flag & ~AT_SYMLINK_NOFOLLOW) {
+ return EINVAL;
+ }
+
+ return fchmodat_internal(vfs_context_current(), uap->path, uap->mode,
+ uap->fd, uap->flag, UIO_USERSPACE);
+}
+
+/*
+ * Change mode of a file given a file descriptor.
+ */
+static int
+fchmod1(__unused proc_t p, int fd, struct vnode_attr *vap)
+{
+ vnode_t vp;
+ int error;
+
+ AUDIT_ARG(fd, fd);
+
+ if ((error = file_vnode(fd, &vp)) != 0) {
+ return error;
+ }
+ if ((error = vnode_getwithref(vp)) != 0) {
+ file_drop(fd);
+ return error;
+ }
+ AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+
+ error = chmod_vnode(vfs_context_current(), vp, vap);
+ (void)vnode_put(vp);
+ file_drop(fd);
+
+ return error;
+}
+
+/*
+ * fchmod_extended: Change mode of a file given a file descriptor; with
+ * extended argument list (including extended security (ACL)).
+ *
+ * Parameters: p Process requesting to change file mode
+ * uap User argument descriptor (see below)
+ * retval (ignored)
+ *
+ * Indirect: uap->mode File mode to set (same as 'chmod')
+ * uap->uid UID to set
+ * uap->gid GID to set
+ * uap->xsecurity ACL to set (or delete)
+ * uap->fd File descriptor of file to change mode
+ *
+ * Returns: 0 Success
+ * !0 errno value
+ *
+ */
+int
+fchmod_extended(proc_t p, struct fchmod_extended_args *uap, __unused int32_t *retval)
+{
+ int error;
+ struct vnode_attr va;
+ kauth_filesec_t xsecdst;
+
+ AUDIT_ARG(owner, uap->uid, uap->gid);
+
+ VATTR_INIT(&va);
+ if (uap->mode != -1) {
+ VATTR_SET(&va, va_mode, uap->mode & ALLPERMS);
+ }
+ if (uap->uid != KAUTH_UID_NONE) {
+ VATTR_SET(&va, va_uid, uap->uid);
+ }
+ if (uap->gid != KAUTH_GID_NONE) {
+ VATTR_SET(&va, va_gid, uap->gid);
+ }
+
+ xsecdst = NULL;
+ switch (uap->xsecurity) {
+ case USER_ADDR_NULL:
+ VATTR_SET(&va, va_acl, NULL);
+ break;
+ case CAST_USER_ADDR_T((void *)1): /* _FILESEC_REMOVE_ACL */
+ VATTR_SET(&va, va_acl, NULL);
+ break;
+ /* not being set */
+ case CAST_USER_ADDR_T(-1):
+ break;
+ default:
+ if ((error = kauth_copyinfilesec(uap->xsecurity, &xsecdst)) != 0) {
+ return error;
+ }
+ VATTR_SET(&va, va_acl, &xsecdst->fsec_acl);
+ }
+
+ error = fchmod1(p, uap->fd, &va);
+
+
+ switch (uap->xsecurity) {
+ case USER_ADDR_NULL:
+ case CAST_USER_ADDR_T(-1):
+ break;
+ default:
+ if (xsecdst != NULL) {
+ kauth_filesec_free(xsecdst);
+ }
+ }
+ return error;
+}
+
+int
+fchmod(proc_t p, struct fchmod_args *uap, __unused int32_t *retval)
+{
+ struct vnode_attr va;
+
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_mode, uap->mode & ALLPERMS);
+
+ return fchmod1(p, uap->fd, &va);
+}
+
+
+/*
+ * Set ownership given a path name.
+ */
+/* ARGSUSED */
+static int
+fchownat_internal(vfs_context_t ctx, int fd, user_addr_t path, uid_t uid,
+ gid_t gid, int flag, enum uio_seg segflg)
+{
+ vnode_t vp;
+ struct vnode_attr va;
+ int error;
+ struct nameidata nd;
+ int follow;
+ kauth_action_t action;
+
+ AUDIT_ARG(owner, uid, gid);
+
+ follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
+ NDINIT(&nd, LOOKUP, OP_SETATTR, follow | AUDITVNPATH1, segflg,
+ path, ctx);
+ error = nameiat(&nd, fd);
+ if (error) {
+ return error;
+ }
+ vp = nd.ni_vp;
+
+ nameidone(&nd);
+
+ VATTR_INIT(&va);
+ if (uid != (uid_t)VNOVAL) {
+ VATTR_SET(&va, va_uid, uid);
+ }
+ if (gid != (gid_t)VNOVAL) {
+ VATTR_SET(&va, va_gid, gid);
+ }
+
+#if CONFIG_MACF
+ error = mac_vnode_check_setowner(ctx, vp, uid, gid);
+ if (error) {
+ goto out;
+ }
+#endif
+
+ /* preflight and authorize attribute changes */
+ if ((error = vnode_authattr(vp, &va, &action, ctx)) != 0) {
+ goto out;
+ }
+ if (action && ((error = vnode_authorize(vp, NULL, action, ctx)) != 0)) {
+ goto out;
+ }
+ error = vnode_setattr(vp, &va, ctx);
+
+#if CONFIG_MACF
+ if (error == 0) {
+ mac_vnode_notify_setowner(ctx, vp, uid, gid);
+ }
+#endif
+
+out:
+ /*
+ * EACCES is only allowed from namei(); permissions failure should
+ * return EPERM, so we need to translate the error code.
+ */
+ if (error == EACCES) {
+ error = EPERM;
+ }
+
+ vnode_put(vp);
+ return error;
+}
+
+int
+chown(__unused proc_t p, struct chown_args *uap, __unused int32_t *retval)
+{
+ return fchownat_internal(vfs_context_current(), AT_FDCWD, uap->path,
+ uap->uid, uap->gid, 0, UIO_USERSPACE);
+}
+
+int
+lchown(__unused proc_t p, struct lchown_args *uap, __unused int32_t *retval)
+{
+ return fchownat_internal(vfs_context_current(), AT_FDCWD, uap->path,
+ uap->owner, uap->group, AT_SYMLINK_NOFOLLOW, UIO_USERSPACE);
+}
+
+int
+fchownat(__unused proc_t p, struct fchownat_args *uap, __unused int32_t *retval)
+{
+ if (uap->flag & ~AT_SYMLINK_NOFOLLOW) {
+ return EINVAL;
+ }
+
+ return fchownat_internal(vfs_context_current(), uap->fd, uap->path,
+ uap->uid, uap->gid, uap->flag, UIO_USERSPACE);
+}
+
+/*
+ * Set ownership given a file descriptor.
+ */
+/* ARGSUSED */
+int
+fchown(__unused proc_t p, struct fchown_args *uap, __unused int32_t *retval)
+{
+ struct vnode_attr va;
+ vfs_context_t ctx = vfs_context_current();
+ vnode_t vp;
+ int error;
+ kauth_action_t action;
+
+ AUDIT_ARG(owner, uap->uid, uap->gid);
+ AUDIT_ARG(fd, uap->fd);
+
+ if ((error = file_vnode(uap->fd, &vp))) {
+ return error;
+ }
+
+ if ((error = vnode_getwithref(vp))) {
+ file_drop(uap->fd);
+ return error;
+ }
+ AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+
+ VATTR_INIT(&va);
+ if (uap->uid != VNOVAL) {
+ VATTR_SET(&va, va_uid, uap->uid);
+ }
+ if (uap->gid != VNOVAL) {
+ VATTR_SET(&va, va_gid, uap->gid);
+ }
+
+#if NAMEDSTREAMS
+ /* chown calls are not allowed for resource forks. */
+ if (vp->v_flag & VISNAMEDSTREAM) {
+ error = EPERM;
+ goto out;
+ }
+#endif
+
+#if CONFIG_MACF
+ error = mac_vnode_check_setowner(ctx, vp, uap->uid, uap->gid);
+ if (error) {
+ goto out;
+ }
+#endif
+
+ /* preflight and authorize attribute changes */
+ if ((error = vnode_authattr(vp, &va, &action, ctx)) != 0) {
+ goto out;
+ }
+ if (action && ((error = vnode_authorize(vp, NULL, action, ctx)) != 0)) {
+ if (error == EACCES) {
+ error = EPERM;
+ }
+ goto out;
+ }
+ error = vnode_setattr(vp, &va, ctx);
+
+#if CONFIG_MACF
+ if (error == 0) {
+ mac_vnode_notify_setowner(ctx, vp, uap->uid, uap->gid);
+ }
+#endif
+
+out:
+ (void)vnode_put(vp);
+ file_drop(uap->fd);
+ return error;
+}
+
+static int
+getutimes(user_addr_t usrtvp, struct timespec *tsp)
+{
+ int error;
+
+ if (usrtvp == USER_ADDR_NULL) {
+ struct timeval old_tv;
+ /* XXX Y2038 bug because of microtime argument */
+ microtime(&old_tv);
+ TIMEVAL_TO_TIMESPEC(&old_tv, &tsp[0]);
+ tsp[1] = tsp[0];
+ } else {
+ if (IS_64BIT_PROCESS(current_proc())) {
+ struct user64_timeval tv[2];
+ error = copyin(usrtvp, (void *)tv, sizeof(tv));
+ if (error) {
+ return error;
+ }
+ TIMEVAL64_TO_TIMESPEC(&tv[0], &tsp[0]);
+ TIMEVAL64_TO_TIMESPEC(&tv[1], &tsp[1]);
+ } else {
+ struct user32_timeval tv[2];
+ error = copyin(usrtvp, (void *)tv, sizeof(tv));
+ if (error) {
+ return error;
+ }
+ TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]);
+ TIMEVAL_TO_TIMESPEC(&tv[1], &tsp[1]);
+ }
+ }
+ return 0;
+}
+
+static int
+setutimes(vfs_context_t ctx, vnode_t vp, const struct timespec *ts,
+ int nullflag)
+{
+ int error;
+ struct vnode_attr va;
+ kauth_action_t action;
+
+ AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_access_time, ts[0]);
+ VATTR_SET(&va, va_modify_time, ts[1]);
+ if (nullflag) {
+ va.va_vaflags |= VA_UTIMES_NULL;
+ }
+
+#if NAMEDSTREAMS
+ /* utimes calls are not allowed for resource forks. */
+ if (vp->v_flag & VISNAMEDSTREAM) {
+ error = EPERM;
+ goto out;
+ }
+#endif
+
+#if CONFIG_MACF
+ error = mac_vnode_check_setutimes(ctx, vp, ts[0], ts[1]);
+ if (error) {
+ goto out;
+ }
+#endif
+ if ((error = vnode_authattr(vp, &va, &action, ctx)) != 0) {
+ if (!nullflag && error == EACCES) {
+ error = EPERM;
+ }
+ goto out;
+ }
+
+ /* since we may not need to auth anything, check here */
+ if ((action != 0) && ((error = vnode_authorize(vp, NULL, action, ctx)) != 0)) {
+ if (!nullflag && error == EACCES) {
+ error = EPERM;
+ }
+ goto out;
+ }
+ error = vnode_setattr(vp, &va, ctx);
+
+#if CONFIG_MACF
+ if (error == 0) {
+ mac_vnode_notify_setutimes(ctx, vp, ts[0], ts[1]);
+ }
+#endif
+
+out:
+ return error;
+}
+
+/*
+ * Set the access and modification times of a file.
+ */
+/* ARGSUSED */
+int
+utimes(__unused proc_t p, struct utimes_args *uap, __unused int32_t *retval)
+{
+ struct timespec ts[2];
+ user_addr_t usrtvp;
+ int error;
+ struct nameidata nd;
+ vfs_context_t ctx = vfs_context_current();
+
+ /*
+ * AUDIT: Needed to change the order of operations to do the
+ * name lookup first because auditing wants the path.
+ */
+ NDINIT(&nd, LOOKUP, OP_SETATTR, FOLLOW | AUDITVNPATH1,
+ UIO_USERSPACE, uap->path, ctx);
+ error = namei(&nd);
+ if (error) {
+ return error;
+ }
+ nameidone(&nd);
+
+ /*
+ * Fetch the user-supplied time. If usrtvp is USER_ADDR_NULL, we fetch
+ * the current time instead.
+ */
+ usrtvp = uap->tptr;
+ if ((error = getutimes(usrtvp, ts)) != 0) {
+ goto out;
+ }
+
+ error = setutimes(ctx, nd.ni_vp, ts, usrtvp == USER_ADDR_NULL);
+
+out:
+ vnode_put(nd.ni_vp);
+ return error;
+}
+
+/*
+ * Set the access and modification times of a file.
+ */
+/* ARGSUSED */
+int
+futimes(__unused proc_t p, struct futimes_args *uap, __unused int32_t *retval)
+{
+ struct timespec ts[2];
+ vnode_t vp;
+ user_addr_t usrtvp;
+ int error;
+
+ AUDIT_ARG(fd, uap->fd);
+ usrtvp = uap->tptr;
+ if ((error = getutimes(usrtvp, ts)) != 0) {
+ return error;
+ }
+ if ((error = file_vnode(uap->fd, &vp)) != 0) {
+ return error;
+ }
+ if ((error = vnode_getwithref(vp))) {
+ file_drop(uap->fd);
+ return error;
+ }
+
+ error = setutimes(vfs_context_current(), vp, ts, usrtvp == 0);
+ vnode_put(vp);
+ file_drop(uap->fd);
+ return error;
+}
+
+/*
+ * Truncate a file given its path name.
+ */
+/* ARGSUSED */
+int
+truncate(proc_t p, struct truncate_args *uap, __unused int32_t *retval)
+{
+ vnode_t vp;
+ struct vnode_attr va;
+ vfs_context_t ctx = vfs_context_current();
+ int error;
+ struct nameidata nd;
+ kauth_action_t action;
+ rlim_t fsize_limit;
+
+ if (uap->length < 0) {
+ return EINVAL;
+ }
+
+ fsize_limit = proc_limitgetcur(p, RLIMIT_FSIZE, TRUE);
+ if ((rlim_t)uap->length > fsize_limit) {
+ psignal(p, SIGXFSZ);
+ return EFBIG;
+ }
+
+ NDINIT(&nd, LOOKUP, OP_TRUNCATE, FOLLOW | AUDITVNPATH1,
+ UIO_USERSPACE, uap->path, ctx);
+ if ((error = namei(&nd))) {
+ return error;
+ }
+ vp = nd.ni_vp;
+
+ nameidone(&nd);
+
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_data_size, uap->length);
+
+#if CONFIG_MACF
+ error = mac_vnode_check_truncate(ctx, NOCRED, vp);
+ if (error) {
+ goto out;
+ }
+#endif
+
+ if ((error = vnode_authattr(vp, &va, &action, ctx)) != 0) {
+ goto out;
+ }
+ if ((action != 0) && ((error = vnode_authorize(vp, NULL, action, ctx)) != 0)) {
+ goto out;
+ }
+ error = vnode_setattr(vp, &va, ctx);
+
+#if CONFIG_MACF
+ if (error == 0) {
+ mac_vnode_notify_truncate(ctx, NOCRED, vp);
+ }
+#endif
+
+out:
+ vnode_put(vp);
+ return error;
+}
+
+/*
+ * Truncate a file given a file descriptor.
+ */
+/* ARGSUSED */
+int
+ftruncate(proc_t p, struct ftruncate_args *uap, int32_t *retval)
+{
+ vfs_context_t ctx = vfs_context_current();
+ struct vnode_attr va;
+ vnode_t vp;
+ struct fileproc *fp;
+ int error;
+ int fd = uap->fd;
+ rlim_t fsize_limit;
+
+ AUDIT_ARG(fd, uap->fd);
+ if (uap->length < 0) {
+ return EINVAL;
+ }
+
+ fsize_limit = proc_limitgetcur(p, RLIMIT_FSIZE, TRUE);
+ if ((rlim_t)uap->length > fsize_limit) {
+ psignal(p, SIGXFSZ);
+ return EFBIG;
+ }
+
+ if ((error = fp_lookup(p, fd, &fp, 0))) {
+ return error;
+ }
+
+ switch (FILEGLOB_DTYPE(fp->fp_glob)) {
+ case DTYPE_PSXSHM:
+ error = pshm_truncate(p, fp, uap->fd, uap->length, retval);
+ goto out;
+ case DTYPE_VNODE:
+ break;
+ default:
+ error = EINVAL;
+ goto out;
+ }
+
+ vp = (vnode_t)fp->fp_glob->fg_data;
+
+ if ((fp->fp_glob->fg_flag & FWRITE) == 0) {
+ AUDIT_ARG(vnpath_withref, vp, ARG_VNODE1);
+ error = EINVAL;
+ goto out;
+ }
+
+ if ((error = vnode_getwithref(vp)) != 0) {
+ goto out;
+ }
+
+ AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+
+#if CONFIG_MACF
+ error = mac_vnode_check_truncate(ctx,
+ fp->fp_glob->fg_cred, vp);
+ if (error) {
+ (void)vnode_put(vp);
+ goto out;
+ }
+#endif
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_data_size, uap->length);
+ error = vnode_setattr(vp, &va, ctx);
+
+#if CONFIG_MACF
+ if (error == 0) {
+ mac_vnode_notify_truncate(ctx, fp->fp_glob->fg_cred, vp);
+ }
+#endif
+
+ (void)vnode_put(vp);
+out:
+ file_drop(fd);
+ return error;
+}
+
+
+/*
+ * Sync an open file with synchronized I/O _file_ integrity completion
+ */
+/* ARGSUSED */
+int
+fsync(proc_t p, struct fsync_args *uap, __unused int32_t *retval)
+{
+ __pthread_testcancel(1);
+ return fsync_common(p, uap, MNT_WAIT);
+}
+
+
+/*
+ * Sync an open file with synchronized I/O _file_ integrity completion
+ *
+ * Notes: This is a legacy support function that does not test for
+ * thread cancellation points.
+ */
+/* ARGSUSED */
+int
+fsync_nocancel(proc_t p, struct fsync_nocancel_args *uap, __unused int32_t *retval)
+{
+ return fsync_common(p, (struct fsync_args *)uap, MNT_WAIT);
+}
+
+
+/*
+ * Sync an open file with synchronized I/O _data_ integrity completion
+ */
+/* ARGSUSED */
+int
+fdatasync(proc_t p, struct fdatasync_args *uap, __unused int32_t *retval)
+{
+ __pthread_testcancel(1);
+ return fsync_common(p, (struct fsync_args *)uap, MNT_DWAIT);
+}
+
+
+/*
+ * fsync_common
+ *
+ * Common fsync code to support both synchronized I/O file integrity completion
+ * (normal fsync) and synchronized I/O data integrity completion (fdatasync).
+ *
+ * If 'flags' is MNT_DWAIT, the caller is requesting data integrity, which
+ * will only guarantee that the file data contents are retrievable. If
+ * 'flags' is MNT_WAIT, the caller is rewuesting file integrity, which also
+ * includes additional metadata unnecessary for retrieving the file data
+ * contents, such as atime, mtime, ctime, etc., also be committed to stable
+ * storage.
+ *
+ * Parameters: p The process
+ * uap->fd The descriptor to synchronize
+ * flags The data integrity flags
+ *
+ * Returns: int Success
+ * fp_getfvp:EBADF Bad file descriptor
+ * fp_getfvp:ENOTSUP fd does not refer to a vnode
+ * VNOP_FSYNC:??? unspecified
+ *
+ * Notes: We use struct fsync_args because it is a short name, and all
+ * caller argument structures are otherwise identical.
+ */
+static int
+fsync_common(proc_t p, struct fsync_args *uap, int flags)
+{
+ vnode_t vp;
+ struct fileproc *fp;
+ vfs_context_t ctx = vfs_context_current();
+ int error;
+
+ AUDIT_ARG(fd, uap->fd);
+
+ if ((error = fp_getfvp(p, uap->fd, &fp, &vp))) {
+ return error;
+ }
+ if ((error = vnode_getwithref(vp))) {
+ file_drop(uap->fd);
+ return error;
+ }
+
+ AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+
+ error = VNOP_FSYNC(vp, flags, ctx);
+
+#if NAMEDRSRCFORK
+ /* Sync resource fork shadow file if necessary. */
+ if ((error == 0) &&
+ (vp->v_flag & VISNAMEDSTREAM) &&
+ (vp->v_parent != NULLVP) &&
+ vnode_isshadow(vp) &&
+ (fp->fp_glob->fg_flag & FWASWRITTEN)) {
+ (void) vnode_flushnamedstream(vp->v_parent, vp, ctx);
+ }
+#endif
+
+ (void)vnode_put(vp);
+ file_drop(uap->fd);
+ return error;
+}
+
+/*
+ * Duplicate files. Source must be a file, target must be a file or
+ * must not exist.
+ *
+ * XXX Copyfile authorisation checking is woefully inadequate, and will not
+ * perform inheritance correctly.
+ */
+/* ARGSUSED */
+int
+copyfile(__unused proc_t p, struct copyfile_args *uap, __unused int32_t *retval)
+{
+ vnode_t tvp, fvp, tdvp, sdvp;
+ struct nameidata fromnd, tond;
+ int error;
+ vfs_context_t ctx = vfs_context_current();
+#if CONFIG_MACF
+ struct filedesc *fdp = (vfs_context_proc(ctx))->p_fd;
+ struct vnode_attr va;
+#endif
+
+ /* Check that the flags are valid. */
+
+ if (uap->flags & ~CPF_MASK) {
+ return EINVAL;
+ }
+
+ NDINIT(&fromnd, LOOKUP, OP_COPYFILE, AUDITVNPATH1,
+ UIO_USERSPACE, uap->from, ctx);
+ if ((error = namei(&fromnd))) {
+ return error;
+ }
+ fvp = fromnd.ni_vp;
+
+ NDINIT(&tond, CREATE, OP_LINK,
+ LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | AUDITVNPATH2 | CN_NBMOUNTLOOK,
+ UIO_USERSPACE, uap->to, ctx);
+ if ((error = namei(&tond))) {
+ goto out1;
+ }
+ tdvp = tond.ni_dvp;
+ tvp = tond.ni_vp;
+
+ if (tvp != NULL) {
+ if (!(uap->flags & CPF_OVERWRITE)) {
+ error = EEXIST;
+ goto out;
+ }
+ }
+
+ if (fvp->v_type == VDIR || (tvp && tvp->v_type == VDIR)) {
+ error = EISDIR;
+ goto out;
+ }
+
+ /* This calls existing MAC hooks for open */
+ if ((error = vn_authorize_open_existing(fvp, &fromnd.ni_cnd, FREAD, ctx,
+ NULL))) {
+ goto out;
+ }
+
+ if (tvp) {
+ /*
+ * See unlinkat_internal for an explanation of the potential
+ * ENOENT from the MAC hook but the gist is that the MAC hook
+ * can fail because vn_getpath isn't able to return the full
+ * path. We choose to ignore this failure.
+ */
+ error = vn_authorize_unlink(tdvp, tvp, &tond.ni_cnd, ctx, NULL);
+ if (error && error != ENOENT) {
+ goto out;
+ }
+ error = 0;
+ }
+
+#if CONFIG_MACF
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_type, fvp->v_type);
+ /* Mask off all but regular access permissions */
+ VATTR_SET(&va, va_mode,
+ ((((uap->mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT) & ACCESSPERMS));
+ error = mac_vnode_check_create(ctx, tdvp, &tond.ni_cnd, &va);
+ if (error) {
+ goto out;
+ }
+#endif /* CONFIG_MACF */
+
+ if ((error = vnode_authorize(tdvp, NULL, KAUTH_VNODE_ADD_FILE, ctx)) != 0) {
+ goto out;
+ }
+
+ if (fvp == tdvp) {
+ error = EINVAL;
+ }
+ /*
+ * If source is the same as the destination (that is the
+ * same inode number) then there is nothing to do.
+ * (fixed to have POSIX semantics - CSM 3/2/98)
+ */
+ if (fvp == tvp) {
+ error = -1;
+ }
+ if (!error) {
+ error = VNOP_COPYFILE(fvp, tdvp, tvp, &tond.ni_cnd, uap->mode, uap->flags, ctx);
+ }
+out:
+ sdvp = tond.ni_startdir;
+ /*
+ * nameidone has to happen before we vnode_put(tdvp)
+ * since it may need to release the fs_nodelock on the tdvp
+ */
+ nameidone(&tond);
+
+ if (tvp) {
+ vnode_put(tvp);
+ }
+ vnode_put(tdvp);
+ vnode_put(sdvp);
+out1:
+ vnode_put(fvp);
+
+ nameidone(&fromnd);
+
+ if (error == -1) {
+ return 0;
+ }
+ return error;
+}
+
+#define CLONE_SNAPSHOT_FALLBACKS_ENABLED 1
+
+/*
+ * Helper function for doing clones. The caller is expected to provide an
+ * iocounted source vnode and release it.
+ */
+static int
+clonefile_internal(vnode_t fvp, boolean_t data_read_authorised, int dst_dirfd,
+ user_addr_t dst, uint32_t flags, vfs_context_t ctx)
+{
+ vnode_t tvp, tdvp;
+ struct nameidata tond;
+ int error;
+ int follow;
+ boolean_t free_src_acl;
+ boolean_t attr_cleanup;
+ enum vtype v_type;
+ kauth_action_t action;
+ struct componentname *cnp;
+ uint32_t defaulted;
+ struct vnode_attr va;
+ struct vnode_attr nva;
+ uint32_t vnop_flags;
+
+ v_type = vnode_vtype(fvp);
+ switch (v_type) {
+ case VLNK:
+ /* FALLTHRU */
+ case VREG:
+ action = KAUTH_VNODE_ADD_FILE;
+ break;
+ case VDIR:
+ if (vnode_isvroot(fvp) || vnode_ismount(fvp) ||
+ fvp->v_mountedhere) {
+ return EINVAL;
+ }
+ action = KAUTH_VNODE_ADD_SUBDIRECTORY;
+ break;
+ default:
+ return EINVAL;
+ }
+
+ AUDIT_ARG(fd2, dst_dirfd);
+ AUDIT_ARG(value32, flags);
+
+ follow = (flags & CLONE_NOFOLLOW) ? NOFOLLOW : FOLLOW;
+ NDINIT(&tond, CREATE, OP_LINK, follow | WANTPARENT | AUDITVNPATH2,
+ UIO_USERSPACE, dst, ctx);
+ if ((error = nameiat(&tond, dst_dirfd))) {
+ return error;
+ }
+ cnp = &tond.ni_cnd;
+ tdvp = tond.ni_dvp;
+ tvp = tond.ni_vp;
+
+ free_src_acl = FALSE;
+ attr_cleanup = FALSE;
+
+ if (tvp != NULL) {
+ error = EEXIST;
+ goto out;
+ }
+
+ if (vnode_mount(tdvp) != vnode_mount(fvp)) {
+ error = EXDEV;
+ goto out;
+ }
+
+#if CONFIG_MACF
+ if ((error = mac_vnode_check_clone(ctx, tdvp, fvp, cnp))) {
+ goto out;
+ }
+#endif
+ if ((error = vnode_authorize(tdvp, NULL, action, ctx))) {
+ goto out;
+ }
+
+ action = KAUTH_VNODE_GENERIC_READ_BITS;
+ if (data_read_authorised) {
+ action &= ~KAUTH_VNODE_READ_DATA;
+ }
+ if ((error = vnode_authorize(fvp, NULL, action, ctx))) {
+ goto out;
+ }
+
+ /*
+ * certain attributes may need to be changed from the source, we ask for
+ * those here.
+ */
+ VATTR_INIT(&va);
+ VATTR_WANTED(&va, va_uid);
+ VATTR_WANTED(&va, va_gid);
+ VATTR_WANTED(&va, va_mode);
+ VATTR_WANTED(&va, va_flags);
+ VATTR_WANTED(&va, va_acl);
+
+ if ((error = vnode_getattr(fvp, &va, ctx)) != 0) {
+ goto out;
+ }
+
+ VATTR_INIT(&nva);
+ VATTR_SET(&nva, va_type, v_type);
+ if (VATTR_IS_SUPPORTED(&va, va_acl) && va.va_acl != NULL) {
+ VATTR_SET(&nva, va_acl, va.va_acl);
+ free_src_acl = TRUE;
+ }
+
+ /* Handle ACL inheritance, initialize vap. */
+ if (v_type == VLNK) {
+ error = vnode_authattr_new(tdvp, &nva, 0, ctx);
+ } else {
+ error = vn_attribute_prepare(tdvp, &nva, &defaulted, ctx);
+ if (error) {
+ goto out;
+ }
+ attr_cleanup = TRUE;
+ }
+
+ vnop_flags = VNODE_CLONEFILE_DEFAULT;
+ /*
+ * We've got initial values for all security parameters,
+ * If we are superuser, then we can change owners to be the
+ * same as the source. Both superuser and the owner have default
+ * WRITE_SECURITY privileges so all other fields can be taken
+ * from source as well.
+ */
+ if (!(flags & CLONE_NOOWNERCOPY) && vfs_context_issuser(ctx)) {
+ if (VATTR_IS_SUPPORTED(&va, va_uid)) {
+ VATTR_SET(&nva, va_uid, va.va_uid);
+ }
+ if (VATTR_IS_SUPPORTED(&va, va_gid)) {
+ VATTR_SET(&nva, va_gid, va.va_gid);
+ }
+ } else {
+ vnop_flags |= VNODE_CLONEFILE_NOOWNERCOPY;
+ }
+
+ if (VATTR_IS_SUPPORTED(&va, va_mode)) {
+ VATTR_SET(&nva, va_mode, va.va_mode);
+ }
+ if (VATTR_IS_SUPPORTED(&va, va_flags)) {
+ VATTR_SET(&nva, va_flags,
+ ((va.va_flags & ~(UF_DATAVAULT | SF_RESTRICTED)) | /* Turn off from source */
+ (nva.va_flags & (UF_DATAVAULT | SF_RESTRICTED))));
+ }
+
+ error = VNOP_CLONEFILE(fvp, tdvp, &tvp, cnp, &nva, vnop_flags, ctx);
+
+ if (!error && tvp) {
+ int update_flags = 0;
+#if CONFIG_FSE
+ int fsevent;
+#endif /* CONFIG_FSE */
+
+ /*
+ * If some of the requested attributes weren't handled by the
+ * VNOP, use our fallback code.
+ */
+ if (!VATTR_ALL_SUPPORTED(&va)) {
+ (void)vnode_setattr_fallback(tvp, &nva, ctx);
+ }
+
+#if CONFIG_MACF
+ (void)vnode_label(vnode_mount(tvp), tdvp, tvp, cnp,
+ VNODE_LABEL_CREATE, ctx);
+#endif
+
+ // Make sure the name & parent pointers are hooked up
+ if (tvp->v_name == NULL) {
+ update_flags |= VNODE_UPDATE_NAME;
+ }
+ if (tvp->v_parent == NULLVP) {
+ update_flags |= VNODE_UPDATE_PARENT;
+ }
+
+ if (update_flags) {
+ (void)vnode_update_identity(tvp, tdvp, cnp->cn_nameptr,
+ cnp->cn_namelen, cnp->cn_hash, update_flags);
+ }
+
+#if CONFIG_FSE
+ switch (vnode_vtype(tvp)) {
+ case VLNK:
+ /* FALLTHRU */
+ case VREG:
+ fsevent = FSE_CREATE_FILE;
+ break;
+ case VDIR:
+ fsevent = FSE_CREATE_DIR;
+ break;
+ default:
+ goto out;
+ }
+
+ if (need_fsevent(fsevent, tvp)) {
+ /*
+ * The following is a sequence of three explicit events.
+ * A pair of FSE_CLONE events representing the source and destination
+ * followed by an FSE_CREATE_[FILE | DIR] for the destination.
+ * fseventsd may coalesce the destination clone and create events
+ * into a single event resulting in the following sequence for a client
+ * FSE_CLONE (src)
+ * FSE_CLONE | FSE_CREATE (dst)
+ */
+ add_fsevent(FSE_CLONE, ctx, FSE_ARG_VNODE, fvp, FSE_ARG_VNODE, tvp,
+ FSE_ARG_DONE);
+ add_fsevent(fsevent, ctx, FSE_ARG_VNODE, tvp,
+ FSE_ARG_DONE);
+ }
+#endif /* CONFIG_FSE */
+ }
+
+out:
+ if (attr_cleanup) {
+ vn_attribute_cleanup(&nva, defaulted);
+ }
+ if (free_src_acl && va.va_acl) {
+ kauth_acl_free(va.va_acl);
+ }
+ nameidone(&tond);
+ if (tvp) {
+ vnode_put(tvp);
+ }
+ vnode_put(tdvp);
+ return error;
+}
+
+/*
+ * clone files or directories, target must not exist.
+ */
+/* ARGSUSED */
+int
+clonefileat(__unused proc_t p, struct clonefileat_args *uap,
+ __unused int32_t *retval)
+{
+ vnode_t fvp;
+ struct nameidata fromnd;
+ int follow;
+ int error;
+ vfs_context_t ctx = vfs_context_current();
+
+ /* Check that the flags are valid. */
+ if (uap->flags & ~(CLONE_NOFOLLOW | CLONE_NOOWNERCOPY)) {
+ return EINVAL;
+ }
+
+ AUDIT_ARG(fd, uap->src_dirfd);
+
+ follow = (uap->flags & CLONE_NOFOLLOW) ? NOFOLLOW : FOLLOW;
+ NDINIT(&fromnd, LOOKUP, OP_COPYFILE, follow | AUDITVNPATH1,
+ UIO_USERSPACE, uap->src, ctx);
+ if ((error = nameiat(&fromnd, uap->src_dirfd))) {
+ return error;
+ }
+
+ fvp = fromnd.ni_vp;
+ nameidone(&fromnd);
+
+ error = clonefile_internal(fvp, FALSE, uap->dst_dirfd, uap->dst,
+ uap->flags, ctx);
+
+ vnode_put(fvp);
+ return error;
+}
+
+int
+fclonefileat(__unused proc_t p, struct fclonefileat_args *uap,
+ __unused int32_t *retval)
+{
+ vnode_t fvp;
+ struct fileproc *fp;
+ int error;
+ vfs_context_t ctx = vfs_context_current();
+
+ /* Check that the flags are valid. */
+ if (uap->flags & ~(CLONE_NOFOLLOW | CLONE_NOOWNERCOPY)) {
+ return EINVAL;
+ }
+
+ AUDIT_ARG(fd, uap->src_fd);
+ error = fp_getfvp(p, uap->src_fd, &fp, &fvp);
+ if (error) {
+ return error;
+ }
+
+ if ((fp->fp_glob->fg_flag & FREAD) == 0) {
+ AUDIT_ARG(vnpath_withref, fvp, ARG_VNODE1);
+ error = EBADF;
+ goto out;
+ }
+
+ if ((error = vnode_getwithref(fvp))) {
+ goto out;
+ }
+
+ AUDIT_ARG(vnpath, fvp, ARG_VNODE1);
+
+ error = clonefile_internal(fvp, TRUE, uap->dst_dirfd, uap->dst,
+ uap->flags, ctx);
+
+ vnode_put(fvp);
+out:
+ file_drop(uap->src_fd);
+ return error;
+}
+
+static int
+rename_submounts_callback(mount_t mp, void *arg)
+{
+ int error = 0;
+ mount_t pmp = (mount_t)arg;
+ int prefix_len = (int)strlen(pmp->mnt_vfsstat.f_mntonname);
+
+ if (strncmp(mp->mnt_vfsstat.f_mntonname, pmp->mnt_vfsstat.f_mntonname, prefix_len) != 0) {
+ return 0;
+ }
+
+ if (mp->mnt_vfsstat.f_mntonname[prefix_len] != '/') {
+ return 0;
+ }
+
+ if ((error = vfs_busy(mp, LK_NOWAIT))) {
+ printf("vfs_busy failed with %d for %s\n", error, mp->mnt_vfsstat.f_mntonname);
+ return -1;
+ }
+
+ int pathlen = MAXPATHLEN;
+ if ((error = vn_getpath_ext(mp->mnt_vnodecovered, NULL, mp->mnt_vfsstat.f_mntonname, &pathlen, VN_GETPATH_FSENTER))) {
+ printf("vn_getpath_ext failed with %d for mnt_vnodecovered of %s\n", error, mp->mnt_vfsstat.f_mntonname);
+ }
+
+ vfs_unbusy(mp);
+
+ return error;
+}
+
+/*
+ * Rename files. Source and destination must either both be directories,
+ * or both not be directories. If target is a directory, it must be empty.
+ */
+/* ARGSUSED */
+static int
+renameat_internal(vfs_context_t ctx, int fromfd, user_addr_t from,
+ int tofd, user_addr_t to, int segflg, vfs_rename_flags_t flags)
+{
+ if (flags & ~VFS_RENAME_FLAGS_MASK) {
+ return EINVAL;
+ }
+
+ if (ISSET(flags, VFS_RENAME_SWAP) && ISSET(flags, VFS_RENAME_EXCL)) {
+ return EINVAL;
+ }
+
+ vnode_t tvp, tdvp;
+ vnode_t fvp, fdvp;
+ vnode_t mnt_fvp;
+ struct nameidata *fromnd, *tond;
+ int error;
+ int do_retry;
+ int retry_count;
+ int mntrename;
+ int need_event;
+ int need_kpath2;
+ int has_listeners;
+ const char *oname = NULL;
+ char *from_name = NULL, *to_name = NULL;
+ char *from_name_no_firmlink = NULL, *to_name_no_firmlink = NULL;
+ int from_len = 0, to_len = 0;
+ int from_len_no_firmlink = 0, to_len_no_firmlink = 0;
+ int holding_mntlock;
+ int vn_authorize_skipped;
+ mount_t locked_mp = NULL;
+ vnode_t oparent = NULLVP;
+#if CONFIG_FSE
+ fse_info from_finfo, to_finfo;
+#endif
+ int from_truncated = 0, to_truncated = 0;
+ int from_truncated_no_firmlink = 0, to_truncated_no_firmlink = 0;
+ int batched = 0;
+ struct vnode_attr *fvap, *tvap;
+ int continuing = 0;
+ /* carving out a chunk for structs that are too big to be on stack. */
+ struct {
+ struct nameidata from_node, to_node;
+ struct vnode_attr fv_attr, tv_attr;
+ } * __rename_data;
+ __rename_data = kheap_alloc(KHEAP_TEMP, sizeof(*__rename_data), Z_WAITOK);
+ fromnd = &__rename_data->from_node;
+ tond = &__rename_data->to_node;
+
+ holding_mntlock = 0;
+ do_retry = 0;
+ retry_count = 0;
+retry:
+ fvp = tvp = NULL;
+ fdvp = tdvp = NULL;
+ fvap = tvap = NULL;
+ mnt_fvp = NULLVP;
+ mntrename = FALSE;
+ vn_authorize_skipped = FALSE;
+
+ NDINIT(fromnd, DELETE, OP_UNLINK, WANTPARENT | AUDITVNPATH1,
+ segflg, from, ctx);
+ fromnd->ni_flag = NAMEI_COMPOUNDRENAME;
+
+ NDINIT(tond, RENAME, OP_RENAME, WANTPARENT | AUDITVNPATH2 | CN_NBMOUNTLOOK,
+ segflg, to, ctx);
+ tond->ni_flag = NAMEI_COMPOUNDRENAME;
+
+continue_lookup:
+ if ((fromnd->ni_flag & NAMEI_CONTLOOKUP) != 0 || !continuing) {
+ if ((error = nameiat(fromnd, fromfd))) {
+ goto out1;
+ }
+ fdvp = fromnd->ni_dvp;
+ fvp = fromnd->ni_vp;
+
+ if (fvp && fvp->v_type == VDIR) {
+ tond->ni_cnd.cn_flags |= WILLBEDIR;
+ }
+ }
+
+ if ((tond->ni_flag & NAMEI_CONTLOOKUP) != 0 || !continuing) {
+ if ((error = nameiat(tond, tofd))) {
+ /*
+ * Translate error code for rename("dir1", "dir2/.").
+ */
+ if (error == EISDIR && fvp->v_type == VDIR) {
+ error = EINVAL;
+ }
+ goto out1;
+ }
+ tdvp = tond->ni_dvp;
+ tvp = tond->ni_vp;
+ }
+
+#if DEVELOPMENT || DEBUG
+ /*
+ * XXX VSWAP: Check for entitlements or special flag here
+ * so we can restrict access appropriately.
+ */
+#else /* DEVELOPMENT || DEBUG */
+
+ if (fromnd->ni_vp && vnode_isswap(fromnd->ni_vp) && (ctx != vfs_context_kernel())) {
+ error = EPERM;
+ goto out1;
+ }
+
+ if (tond->ni_vp && vnode_isswap(tond->ni_vp) && (ctx != vfs_context_kernel())) {
+ error = EPERM;
+ goto out1;
+ }
+#endif /* DEVELOPMENT || DEBUG */
+
+ if (!tvp && ISSET(flags, VFS_RENAME_SWAP)) {
+ error = ENOENT;
+ goto out1;
+ }
+
+ if (tvp && ISSET(flags, VFS_RENAME_EXCL)) {
+ int32_t pval = 0;
+ int err = 0;
+
+ /*
+ * We allow rename with VFS_RENAME_EXCL flag for an existing file which
+ * has the same name as target iff the following conditions are met:
+ * 1. the target file system is case insensitive
+ * 2. source and target directories are the same
+ * 3. source and target files are the same
+ * 4. name only differs in case (determined by underlying filesystem)
+ */
+ if (fvp != tvp || fdvp != tdvp) {
+ error = EEXIST;
+ goto out1;
+ }
+
+ /*
+ * Assume that the target file system is case sensitive if
+ * _PC_CASE_SENSITIVE selector isn't supported.
+ */
+ err = VNOP_PATHCONF(tvp, _PC_CASE_SENSITIVE, &pval, ctx);
+ if (err != 0 || pval != 0) {
+ error = EEXIST;
+ goto out1;
+ }
+ }
+
+ batched = vnode_compound_rename_available(fdvp);
+
+#if CONFIG_FSE
+ need_event = need_fsevent(FSE_RENAME, fdvp);
+ if (need_event) {
+ if (fvp) {
+ get_fse_info(fvp, &from_finfo, ctx);
+ } else {
+ error = vfs_get_notify_attributes(&__rename_data->fv_attr);
+ if (error) {
+ goto out1;
+ }
+
+ fvap = &__rename_data->fv_attr;
+ }
+
+ if (tvp) {
+ get_fse_info(tvp, &to_finfo, ctx);
+ } else if (batched) {
+ error = vfs_get_notify_attributes(&__rename_data->tv_attr);
+ if (error) {
+ goto out1;
+ }
+
+ tvap = &__rename_data->tv_attr;
+ }
+ }
+#else
+ need_event = 0;
+#endif /* CONFIG_FSE */
+
+ has_listeners = kauth_authorize_fileop_has_listeners();
+
+ need_kpath2 = 0;
+#if CONFIG_AUDIT
+ if (AUDIT_RECORD_EXISTS()) {
+ need_kpath2 = 1;
+ }
+#endif
+
+ if (need_event || has_listeners) {
+ if (from_name == NULL) {
+ GET_PATH(from_name);
+ }
+
+ from_len = safe_getpath(fdvp, fromnd->ni_cnd.cn_nameptr, from_name, MAXPATHLEN, &from_truncated);
+
+ if (from_name_no_firmlink == NULL) {
+ GET_PATH(from_name_no_firmlink);
+ }
+
+ from_len_no_firmlink = safe_getpath_no_firmlink(fdvp, fromnd->ni_cnd.cn_nameptr, from_name_no_firmlink, MAXPATHLEN, &from_truncated_no_firmlink);
+ }
+
+ if (need_event || need_kpath2 || has_listeners) {
+ if (to_name == NULL) {
+ GET_PATH(to_name);
+ }
+
+ to_len = safe_getpath(tdvp, tond->ni_cnd.cn_nameptr, to_name, MAXPATHLEN, &to_truncated);
+
+ if (to_name_no_firmlink == NULL) {
+ GET_PATH(to_name_no_firmlink);
+ }
+
+ to_len_no_firmlink = safe_getpath_no_firmlink(tdvp, tond->ni_cnd.cn_nameptr, to_name_no_firmlink, MAXPATHLEN, &to_truncated_no_firmlink);
+ if (to_name && need_kpath2) {
+ AUDIT_ARG(kpath, to_name, ARG_KPATH2);
+ }
+ }
+ if (!fvp) {
+ /*
+ * Claim: this check will never reject a valid rename.
+ * For success, either fvp must be on the same mount as tdvp, or fvp must sit atop a vnode on the same mount as tdvp.
+ * Suppose fdvp and tdvp are not on the same mount.
+ * If fvp is on the same mount as tdvp, then fvp is not on the same mount as fdvp, so fvp is the root of its filesystem. If fvp is the root,
+ * then you can't move it to within another dir on the same mountpoint.
+ * If fvp sits atop a vnode on the same mount as fdvp, then that vnode must be part of the same mount as fdvp, which is a contradiction.
+ *
+ * If this check passes, then we are safe to pass these vnodes to the same FS.
+ */
+ if (fdvp->v_mount != tdvp->v_mount) {
+ error = EXDEV;
+ goto out1;
+ }
+ goto skipped_lookup;
+ }
+
+ /*
+ * If the source and destination are the same (i.e. they're
+ * links to the same vnode) and the target file system is
+ * case sensitive, then there is nothing to do.
+ *
+ * XXX Come back to this.
+ */
+ if (fvp == tvp) {
+ int pathconf_val;
+
+ /*
+ * Note: if _PC_CASE_SENSITIVE selector isn't supported,
+ * then assume that this file system is case sensitive.
+ */
+ if (VNOP_PATHCONF(fvp, _PC_CASE_SENSITIVE, &pathconf_val, ctx) != 0 ||
+ pathconf_val != 0) {
+ vn_authorize_skipped = TRUE;
+ goto out1;
+ }
+ }
+
+ /*
+ * Allow the renaming of mount points.
+ * - target must not exist
+ * - target must reside in the same directory as source
+ * - union mounts cannot be renamed
+ * - the root fs, and tightly-linked system volumes, cannot be renamed
+ *
+ * XXX Handle this in VFS after a continued lookup (if we missed
+ * in the cache to start off)
+ *
+ * N.B. If RENAME_SWAP is being used, then @tvp != NULL and so
+ * we'll skip past here. The file system is responsible for
+ * checking that @tvp is not a descendent of @fvp and vice versa
+ * so it should always return EINVAL if either @tvp or @fvp is the
+ * root of a volume.
+ */
+ if ((fvp->v_flag & VROOT) &&
+ (fvp->v_type == VDIR) &&
+ (tvp == NULL) &&
+ (fvp->v_mountedhere == NULL) &&
+ (fdvp == tdvp) &&
+ ((fvp->v_mount->mnt_flag & (MNT_UNION | MNT_ROOTFS)) == 0) &&
+ ((fvp->v_mount->mnt_kern_flag & MNTK_SYSTEM) == 0) &&
+ (fvp->v_mount->mnt_vnodecovered != NULLVP)) {
+ vnode_t coveredvp;
+
+ /* switch fvp to the covered vnode */
+ coveredvp = fvp->v_mount->mnt_vnodecovered;
+ if ((vnode_getwithref(coveredvp))) {
+ error = ENOENT;
+ goto out1;
+ }
+ /*
+ * Save the 'fvp' as it is needed for vn_authorize_renamex_with_paths()
+ * later.
+ */
+ mnt_fvp = fvp;
+
+ fvp = coveredvp;
+ mntrename = TRUE;
+ }
+ /*
+ * Check for cross-device rename.
+ */
+ if ((fvp->v_mount != tdvp->v_mount) ||
+ (tvp && (fvp->v_mount != tvp->v_mount))) {
+ error = EXDEV;
+ goto out1;
+ }
+
+ /*
+ * If source is the same as the destination (that is the
+ * same inode number) then there is nothing to do...
+ * EXCEPT if the underlying file system supports case
+ * insensitivity and is case preserving. In this case
+ * the file system needs to handle the special case of
+ * getting the same vnode as target (fvp) and source (tvp).
+ *
+ * Only file systems that support pathconf selectors _PC_CASE_SENSITIVE
+ * and _PC_CASE_PRESERVING can have this exception, and they need to
+ * handle the special case of getting the same vnode as target and
+ * source. NOTE: Then the target is unlocked going into vnop_rename,
+ * so not to cause locking problems. There is a single reference on tvp.
+ *
+ * NOTE - that fvp == tvp also occurs if they are hard linked and
+ * that correct behaviour then is just to return success without doing
+ * anything.
+ *
+ * XXX filesystem should take care of this itself, perhaps...
+ */
+ if (fvp == tvp && fdvp == tdvp) {
+ if (fromnd->ni_cnd.cn_namelen == tond->ni_cnd.cn_namelen &&
+ !bcmp(fromnd->ni_cnd.cn_nameptr, tond->ni_cnd.cn_nameptr,
+ fromnd->ni_cnd.cn_namelen)) {
+ vn_authorize_skipped = TRUE;
+ goto out1;
+ }
+ }
+
+ if (holding_mntlock && fvp->v_mount != locked_mp) {
+ /*
+ * we're holding a reference and lock
+ * on locked_mp, but it no longer matches
+ * what we want to do... so drop our hold
+ */
+ mount_unlock_renames(locked_mp);
+ mount_drop(locked_mp, 0);
+ holding_mntlock = 0;
+ }
+ if (tdvp != fdvp && fvp->v_type == VDIR) {
+ /*
+ * serialize renames that re-shape
+ * the tree... if holding_mntlock is
+ * set, then we're ready to go...
+ * otherwise we
+ * first need to drop the iocounts
+ * we picked up, second take the
+ * lock to serialize the access,
+ * then finally start the lookup
+ * process over with the lock held
+ */
+ if (!holding_mntlock) {
+ /*
+ * need to grab a reference on
+ * the mount point before we
+ * drop all the iocounts... once
+ * the iocounts are gone, the mount
+ * could follow
+ */
+ locked_mp = fvp->v_mount;
+ mount_ref(locked_mp, 0);
+
+ /*
+ * nameidone has to happen before we vnode_put(tvp)
+ * since it may need to release the fs_nodelock on the tvp
+ */
+ nameidone(tond);
+
+ if (tvp) {
+ vnode_put(tvp);
+ }
+ vnode_put(tdvp);
+
+ /*
+ * nameidone has to happen before we vnode_put(fdvp)
+ * since it may need to release the fs_nodelock on the fvp
+ */
+ nameidone(fromnd);
+
+ vnode_put(fvp);
+ vnode_put(fdvp);
+
+ if (mnt_fvp != NULLVP) {
+ vnode_put(mnt_fvp);
+ }
+
+ mount_lock_renames(locked_mp);
+ holding_mntlock = 1;
+
+ goto retry;
+ }
+ } else {
+ /*
+ * when we dropped the iocounts to take
+ * the lock, we allowed the identity of
+ * the various vnodes to change... if they did,
+ * we may no longer be dealing with a rename
+ * that reshapes the tree... once we're holding
+ * the iocounts, the vnodes can't change type
+ * so we're free to drop the lock at this point
+ * and continue on
+ */
+ if (holding_mntlock) {
+ mount_unlock_renames(locked_mp);
+ mount_drop(locked_mp, 0);
+ holding_mntlock = 0;
+ }
+ }
+
+ if (!batched) {
+ error = vn_authorize_renamex_with_paths(fdvp, mntrename ? mnt_fvp : fvp,
+ &fromnd->ni_cnd, from_name, tdvp, tvp, &tond->ni_cnd, to_name, ctx,
+ flags, NULL);
+ if (error) {
+ if (error == ENOENT) {
+ if (retry_count < MAX_AUTHORIZE_ENOENT_RETRIES) {
+ /*
+ * We encountered a race where after doing the namei,
+ * tvp stops being valid. If so, simply re-drive the rename
+ * call from the top.
+ */
+ do_retry = 1;
+ retry_count += 1;
+ }
+ }
+ goto out1;
+ }
+ }
+
+ /* Release the 'mnt_fvp' now that it is no longer needed. */
+ if (mnt_fvp != NULLVP) {
+ vnode_put(mnt_fvp);
+ mnt_fvp = NULLVP;
+ }
+
+ // save these off so we can later verify that fvp is the same
+ oname = fvp->v_name;
+ oparent = fvp->v_parent;
+
+skipped_lookup:
+ error = vn_rename(fdvp, &fvp, &fromnd->ni_cnd, fvap,
+ tdvp, &tvp, &tond->ni_cnd, tvap,
+ flags, ctx);
+
+ if (holding_mntlock) {
+ /*
+ * we can drop our serialization
+ * lock now
+ */
+ mount_unlock_renames(locked_mp);
+ mount_drop(locked_mp, 0);
+ holding_mntlock = 0;
+ }
+ if (error) {
+ if (error == EDATALESS) {
+ /*
+ * If we've been here before, something has gone
+ * horribly wrong and we should just get out lest
+ * we spiral around the drain forever.
+ */
+ if (flags & VFS_RENAME_DATALESS) {
+ error = EIO;
+ goto out1;
+ }
+
+ /*
+ * The object we're renaming is dataless (or has a
+ * dataless descendent) and requires materialization
+ * before the rename occurs. But we're holding the
+ * mount point's rename lock, so it's not safe to
+ * make the upcall.
+ *
+ * In this case, we release the lock, perform the
+ * materialization, and start the whole thing over.
+ */
+ error = vnode_materialize_dataless_file(fvp,
+ NAMESPACE_HANDLER_RENAME_OP);
+
+ if (error == 0) {
+ /*
+ * The next time around we need to tell the
+ * file system that the materializtaion has
+ * been performed.
+ */
+ flags |= VFS_RENAME_DATALESS;
+ do_retry = 1;
+ }
+ goto out1;
+ }
+ if (error == EKEEPLOOKING) {
+ if ((fromnd->ni_flag & NAMEI_CONTLOOKUP) == 0) {
+ if ((tond->ni_flag & NAMEI_CONTLOOKUP) == 0) {
+ panic("EKEEPLOOKING without NAMEI_CONTLOOKUP on either ndp?");
+ }
+ }
+
+ fromnd->ni_vp = fvp;
+ tond->ni_vp = tvp;
+
+ goto continue_lookup;
+ }
+
+ /*
+ * We may encounter a race in the VNOP where the destination didn't
+ * exist when we did the namei, but it does by the time we go and
+ * try to create the entry. In this case, we should re-drive this rename
+ * call from the top again. Currently, only HFS bubbles out ERECYCLE,
+ * but other filesystems susceptible to this race could return it, too.
+ */
+ if (error == ERECYCLE) {
+ if (retry_count < MAX_RENAME_ERECYCLE_RETRIES) {
+ do_retry = 1;
+ retry_count += 1;
+ } else {
+ printf("rename retry limit due to ERECYCLE reached\n");
+ error = ENOENT;
+ }
+ }
+
+ /*
+ * For compound VNOPs, the authorization callback may return
+ * ENOENT in case of racing hardlink lookups hitting the name
+ * cache, redrive the lookup.
+ */
+ if (batched && error == ENOENT) {
+ if (retry_count < MAX_AUTHORIZE_ENOENT_RETRIES) {
+ do_retry = 1;
+ retry_count += 1;
+ }
+ }
+
+ goto out1;
+ }
+
+ /* call out to allow 3rd party notification of rename.
+ * Ignore result of kauth_authorize_fileop call.
+ */
+ kauth_authorize_fileop(vfs_context_ucred(ctx),
+ KAUTH_FILEOP_RENAME,
+ (uintptr_t)from_name, (uintptr_t)to_name);
+ if (flags & VFS_RENAME_SWAP) {
+ kauth_authorize_fileop(vfs_context_ucred(ctx),
+ KAUTH_FILEOP_RENAME,
+ (uintptr_t)to_name, (uintptr_t)from_name);
+ }
+
+#if CONFIG_FSE
+ if (from_name != NULL && to_name != NULL) {
+ if (from_truncated || to_truncated) {
+ // set it here since only the from_finfo gets reported up to user space
+ from_finfo.mode |= FSE_TRUNCATED_PATH;
+ }
+
+ if (tvap && tvp) {
+ vnode_get_fse_info_from_vap(tvp, &to_finfo, tvap);
+ }
+ if (fvap) {
+ vnode_get_fse_info_from_vap(fvp, &from_finfo, fvap);
+ }
+
+ if (tvp) {
+ add_fsevent(FSE_RENAME, ctx,
+ FSE_ARG_STRING, from_len_no_firmlink, from_name_no_firmlink,
+ FSE_ARG_FINFO, &from_finfo,
+ FSE_ARG_STRING, to_len_no_firmlink, to_name_no_firmlink,
+ FSE_ARG_FINFO, &to_finfo,
+ FSE_ARG_DONE);
+ if (flags & VFS_RENAME_SWAP) {
+ /*
+ * Strictly speaking, swap is the equivalent of
+ * *three* renames. FSEvents clients should only take
+ * the events as a hint, so we only bother reporting
+ * two.
+ */
+ add_fsevent(FSE_RENAME, ctx,
+ FSE_ARG_STRING, to_len_no_firmlink, to_name_no_firmlink,
+ FSE_ARG_FINFO, &to_finfo,
+ FSE_ARG_STRING, from_len_no_firmlink, from_name_no_firmlink,
+ FSE_ARG_FINFO, &from_finfo,
+ FSE_ARG_DONE);
+ }
+ } else {
+ add_fsevent(FSE_RENAME, ctx,
+ FSE_ARG_STRING, from_len_no_firmlink, from_name_no_firmlink,
+ FSE_ARG_FINFO, &from_finfo,
+ FSE_ARG_STRING, to_len_no_firmlink, to_name_no_firmlink,
+ FSE_ARG_DONE);
+ }
+ }
+#endif /* CONFIG_FSE */
+
+ /*
+ * update filesystem's mount point data
+ */
+ if (mntrename) {
+ char *cp, *pathend, *mpname;
+ char * tobuf;
+ struct mount *mp;
+ int maxlen;
+ size_t len = 0;
+
+ mp = fvp->v_mountedhere;
+
+ if (vfs_busy(mp, LK_NOWAIT)) {
+ error = EBUSY;
+ goto out1;
+ }
+ tobuf = zalloc(ZV_NAMEI);
+
+ if (UIO_SEG_IS_USER_SPACE(segflg)) {
+ error = copyinstr(to, tobuf, MAXPATHLEN, &len);
+ } else {
+ error = copystr((void *)to, tobuf, MAXPATHLEN, &len);
+ }
+ if (!error) {
+ /* find current mount point prefix */
+ pathend = &mp->mnt_vfsstat.f_mntonname[0];
+ for (cp = pathend; *cp != '\0'; ++cp) {
+ if (*cp == '/') {
+ pathend = cp + 1;
+ }
+ }
+ /* find last component of target name */
+ for (mpname = cp = tobuf; *cp != '\0'; ++cp) {
+ if (*cp == '/') {
+ mpname = cp + 1;
+ }
+ }
+
+ /* Update f_mntonname of sub mounts */
+ vfs_iterate(0, rename_submounts_callback, (void *)mp);
+
+ /* append name to prefix */
+ maxlen = MAXPATHLEN - (int)(pathend - mp->mnt_vfsstat.f_mntonname);
+ bzero(pathend, maxlen);
+
+ strlcpy(pathend, mpname, maxlen);
+ }
+ zfree(ZV_NAMEI, tobuf);
+
+ vfs_unbusy(mp);
+
+ vfs_event_signal(NULL, VQ_UPDATE, (intptr_t)NULL);
+ }
+ /*
+ * fix up name & parent pointers. note that we first
+ * check that fvp has the same name/parent pointers it
+ * had before the rename call... this is a 'weak' check
+ * at best...
+ *
+ * XXX oparent and oname may not be set in the compound vnop case
+ */
+ if (batched || (oname == fvp->v_name && oparent == fvp->v_parent)) {
+ int update_flags;
+
+ update_flags = VNODE_UPDATE_NAME;
+
+ if (fdvp != tdvp) {
+ update_flags |= VNODE_UPDATE_PARENT;
+ }
+
+ vnode_update_identity(fvp, tdvp, tond->ni_cnd.cn_nameptr, tond->ni_cnd.cn_namelen, tond->ni_cnd.cn_hash, update_flags);
+ }
+out1:
+ /*
+ * There are some cases (for e.g. 'fvp == tvp') when vn_authorize was
+ * skipped earlier as no actual rename was performed.
+ */
+ if (vn_authorize_skipped && error == 0) {
+ error = vn_authorize_renamex_with_paths(fdvp, fvp,
+ &fromnd->ni_cnd, from_name, tdvp, tvp, &tond->ni_cnd, to_name, ctx,
+ flags, NULL);
+ if (error && error == ENOENT) {
+ if (retry_count < MAX_AUTHORIZE_ENOENT_RETRIES) {
+ do_retry = 1;
+ retry_count += 1;
+ }
+ }
+ }
+ if (to_name != NULL) {
+ RELEASE_PATH(to_name);
+ to_name = NULL;
+ }
+ if (to_name_no_firmlink != NULL) {
+ RELEASE_PATH(to_name_no_firmlink);
+ to_name_no_firmlink = NULL;
+ }
+ if (from_name != NULL) {
+ RELEASE_PATH(from_name);
+ from_name = NULL;
+ }
+ if (from_name_no_firmlink != NULL) {
+ RELEASE_PATH(from_name_no_firmlink);
+ from_name_no_firmlink = NULL;
+ }
+ if (holding_mntlock) {
+ mount_unlock_renames(locked_mp);
+ mount_drop(locked_mp, 0);
+ holding_mntlock = 0;
+ }
+ if (tdvp) {
+ /*
+ * nameidone has to happen before we vnode_put(tdvp)
+ * since it may need to release the fs_nodelock on the tdvp
+ */
+ nameidone(tond);
+
+ if (tvp) {
+ vnode_put(tvp);
+ }
+ vnode_put(tdvp);
+ }
+ if (fdvp) {
+ /*
+ * nameidone has to happen before we vnode_put(fdvp)
+ * since it may need to release the fs_nodelock on the fdvp
+ */
+ nameidone(fromnd);
+
+ if (fvp) {
+ vnode_put(fvp);
+ }
+ vnode_put(fdvp);
+ }
+ if (mnt_fvp != NULLVP) {
+ vnode_put(mnt_fvp);
+ }
+ /*
+ * If things changed after we did the namei, then we will re-drive
+ * this rename call from the top.
+ */
+ if (do_retry) {
+ do_retry = 0;
+ goto retry;
+ }
+
+ kheap_free(KHEAP_TEMP, __rename_data, sizeof(*__rename_data));
+ return error;
+}
+
+int
+rename(__unused proc_t p, struct rename_args *uap, __unused int32_t *retval)
+{
+ return renameat_internal(vfs_context_current(), AT_FDCWD, uap->from,
+ AT_FDCWD, uap->to, UIO_USERSPACE, 0);
+}
+
+int
+renameatx_np(__unused proc_t p, struct renameatx_np_args *uap, __unused int32_t *retval)
+{
+ return renameat_internal(
+ vfs_context_current(),
+ uap->fromfd, uap->from,
+ uap->tofd, uap->to,
+ UIO_USERSPACE, uap->flags);
+}
+
+int
+renameat(__unused proc_t p, struct renameat_args *uap, __unused int32_t *retval)
+{
+ return renameat_internal(vfs_context_current(), uap->fromfd, uap->from,
+ uap->tofd, uap->to, UIO_USERSPACE, 0);
+}
+
+/*
+ * Make a directory file.
+ *
+ * Returns: 0 Success
+ * EEXIST
+ * namei:???
+ * vnode_authorize:???
+ * vn_create:???
+ */
+/* ARGSUSED */
+static int
+mkdir1at(vfs_context_t ctx, user_addr_t path, struct vnode_attr *vap, int fd,
+ enum uio_seg segflg)
+{
+ vnode_t vp, dvp;
+ int error;
+ int update_flags = 0;
+ int batched;
+ struct nameidata nd;
+
+ AUDIT_ARG(mode, vap->va_mode);
+ NDINIT(&nd, CREATE, OP_MKDIR, LOCKPARENT | AUDITVNPATH1, segflg,
+ path, ctx);
+ nd.ni_cnd.cn_flags |= WILLBEDIR;
+ nd.ni_flag = NAMEI_COMPOUNDMKDIR;
+
+continue_lookup:
+ error = nameiat(&nd, fd);
+ if (error) {
+ return error;
+ }
+ dvp = nd.ni_dvp;
+ vp = nd.ni_vp;
+
+ if (vp != NULL) {
+ error = EEXIST;
+ goto out;
+ }
+
+ batched = vnode_compound_mkdir_available(dvp);
+
+ VATTR_SET(vap, va_type, VDIR);
+
+ /*
+ * XXX
+ * Don't authorize in VFS for compound VNOP.... mkdir -p today assumes that it will
+ * only get EXISTS or EISDIR for existing path components, and not that it could see
+ * EACCESS/EPERM--so if we authorize for mkdir on "/" for "mkdir -p /tmp/foo/bar/baz"
+ * it will fail in a spurious manner. Need to figure out if this is valid behavior.
+ */
+ if ((error = vn_authorize_mkdir(dvp, &nd.ni_cnd, vap, ctx, NULL)) != 0) {
+ if (error == EACCES || error == EPERM) {
+ int error2;
+
+ nameidone(&nd);
+ vnode_put(dvp);
+ dvp = NULLVP;
+
+ /*
+ * Try a lookup without "NAMEI_COMPOUNDVNOP" to make sure we return EEXIST
+ * rather than EACCESS if the target exists.
+ */
+ NDINIT(&nd, LOOKUP, OP_MKDIR, AUDITVNPATH1, segflg,
+ path, ctx);
+ error2 = nameiat(&nd, fd);
+ if (error2) {
+ goto out;
+ } else {
+ vp = nd.ni_vp;
+ error = EEXIST;
+ goto out;
+ }
+ }
+
+ goto out;
+ }
+
+ /*
+ * make the directory
+ */
+ if ((error = vn_create(dvp, &vp, &nd, vap, 0, 0, NULL, ctx)) != 0) {
+ if (error == EKEEPLOOKING) {
+ nd.ni_vp = vp;
+ goto continue_lookup;
+ }
+
+ goto out;
+ }
+
+ // Make sure the name & parent pointers are hooked up
+ if (vp->v_name == NULL) {
+ update_flags |= VNODE_UPDATE_NAME;
+ }
+ if (vp->v_parent == NULLVP) {
+ update_flags |= VNODE_UPDATE_PARENT;
+ }
+
+ if (update_flags) {
+ vnode_update_identity(vp, dvp, nd.ni_cnd.cn_nameptr, nd.ni_cnd.cn_namelen, nd.ni_cnd.cn_hash, update_flags);
+ }
+
+#if CONFIG_FSE
+ add_fsevent(FSE_CREATE_DIR, ctx, FSE_ARG_VNODE, vp, FSE_ARG_DONE);
+#endif
+
+out:
+ /*
+ * nameidone has to happen before we vnode_put(dvp)
+ * since it may need to release the fs_nodelock on the dvp
+ */
+ nameidone(&nd);
+
+ if (vp) {
+ vnode_put(vp);
+ }
+ if (dvp) {
+ vnode_put(dvp);
+ }
+
+ return error;
+}
+
+/*
+ * mkdir_extended: Create a directory; with extended security (ACL).
+ *
+ * Parameters: p Process requesting to create the directory
+ * uap User argument descriptor (see below)
+ * retval (ignored)
+ *
+ * Indirect: uap->path Path of directory to create
+ * uap->mode Access permissions to set
+ * uap->xsecurity ACL to set
+ *
+ * Returns: 0 Success
+ * !0 Not success
+ *
+ */
+int
+mkdir_extended(proc_t p, struct mkdir_extended_args *uap, __unused int32_t *retval)
+{
+ int ciferror;
+ kauth_filesec_t xsecdst;
+ struct vnode_attr va;
+
+ AUDIT_ARG(owner, uap->uid, uap->gid);
+
+ xsecdst = NULL;
+ if ((uap->xsecurity != USER_ADDR_NULL) &&
+ ((ciferror = kauth_copyinfilesec(uap->xsecurity, &xsecdst)) != 0)) {
+ return ciferror;
+ }
+
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_mode, (uap->mode & ACCESSPERMS) & ~p->p_fd->fd_cmask);
+ if (xsecdst != NULL) {
+ VATTR_SET(&va, va_acl, &xsecdst->fsec_acl);
+ }
+
+ ciferror = mkdir1at(vfs_context_current(), uap->path, &va, AT_FDCWD,
+ UIO_USERSPACE);
+ if (xsecdst != NULL) {
+ kauth_filesec_free(xsecdst);
+ }
+ return ciferror;
+}
+
+int
+mkdir(proc_t p, struct mkdir_args *uap, __unused int32_t *retval)
+{
+ struct vnode_attr va;
+
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_mode, (uap->mode & ACCESSPERMS) & ~p->p_fd->fd_cmask);
+
+ return mkdir1at(vfs_context_current(), uap->path, &va, AT_FDCWD,
+ UIO_USERSPACE);
+}
+
+int
+mkdirat(proc_t p, struct mkdirat_args *uap, __unused int32_t *retval)
+{
+ struct vnode_attr va;
+
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_mode, (uap->mode & ACCESSPERMS) & ~p->p_fd->fd_cmask);
+
+ return mkdir1at(vfs_context_current(), uap->path, &va, uap->fd,
+ UIO_USERSPACE);
+}
+
+static int
+rmdirat_internal(vfs_context_t ctx, int fd, user_addr_t dirpath,
+ enum uio_seg segflg, int unlink_flags)
+{
+ vnode_t vp, dvp;
+ int error;
+ struct nameidata nd;
+ char *path = NULL;
+ char *no_firmlink_path = NULL;
+ int len_path = 0;
+ int len_no_firmlink_path = 0;
+ int has_listeners = 0;
+ int need_event = 0;
+ int truncated_path = 0;
+ int truncated_no_firmlink_path = 0;
+#if CONFIG_FSE
+ struct vnode_attr va;
+#endif /* CONFIG_FSE */
+ struct vnode_attr *vap = NULL;
+ int restart_count = 0;
+ int batched;
+
+ int restart_flag;
+
+ /*
+ * This loop exists to restart rmdir in the unlikely case that two
+ * processes are simultaneously trying to remove the same directory
+ * containing orphaned appleDouble files.
+ */
+ do {
+ NDINIT(&nd, DELETE, OP_RMDIR, LOCKPARENT | AUDITVNPATH1,
+ segflg, dirpath, ctx);
+ nd.ni_flag = NAMEI_COMPOUNDRMDIR;
+continue_lookup:
+ restart_flag = 0;
+ vap = NULL;
+
+ error = nameiat(&nd, fd);
+ if (error) {
+ return error;
+ }
+
+ dvp = nd.ni_dvp;
+ vp = nd.ni_vp;
+
+ if (vp) {
+ batched = vnode_compound_rmdir_available(vp);
+
+ if (vp->v_flag & VROOT) {
+ /*
+ * The root of a mounted filesystem cannot be deleted.
+ */
+ error = EBUSY;
+ goto out;
+ }
+
+#if DEVELOPMENT || DEBUG
+ /*
+ * XXX VSWAP: Check for entitlements or special flag here
+ * so we can restrict access appropriately.
+ */
+#else /* DEVELOPMENT || DEBUG */
+
+ if (vnode_isswap(vp) && (ctx != vfs_context_kernel())) {
+ error = EPERM;
+ goto out;
+ }
+#endif /* DEVELOPMENT || DEBUG */
+
+ /*
+ * Removed a check here; we used to abort if vp's vid
+ * was not the same as what we'd seen the last time around.
+ * I do not think that check was valid, because if we retry
+ * and all dirents are gone, the directory could legitimately
+ * be recycled but still be present in a situation where we would
+ * have had permission to delete. Therefore, we won't make
+ * an effort to preserve that check now that we may not have a
+ * vp here.
+ */
+
+ if (!batched) {
+ error = vn_authorize_rmdir(dvp, vp, &nd.ni_cnd, ctx, NULL);
+ if (error) {
+ if (error == ENOENT) {
+ if (restart_count < MAX_AUTHORIZE_ENOENT_RETRIES) {
+ restart_flag = 1;
+ restart_count += 1;
+ }
+ }
+ goto out;
+ }
+ }
+ } else {
+ batched = 1;
+
+ if (!vnode_compound_rmdir_available(dvp)) {
+ panic("No error, but no compound rmdir?");
+ }
+ }
+
+#if CONFIG_FSE
+ fse_info finfo = {0};
+
+ need_event = need_fsevent(FSE_DELETE, dvp);
+ if (need_event) {
+ if (!batched) {
+ get_fse_info(vp, &finfo, ctx);
+ } else {
+ error = vfs_get_notify_attributes(&va);
+ if (error) {
+ goto out;
+ }
+
+ vap = &va;
+ }
+ }
+#endif
+ has_listeners = kauth_authorize_fileop_has_listeners();
+ if (need_event || has_listeners) {
+ if (path == NULL) {
+ GET_PATH(path);
+ }
+
+ len_path = safe_getpath(dvp, nd.ni_cnd.cn_nameptr, path, MAXPATHLEN, &truncated_path);
+
+ if (no_firmlink_path == NULL) {
+ GET_PATH(no_firmlink_path);
+ }
+
+ len_no_firmlink_path = safe_getpath_no_firmlink(dvp, nd.ni_cnd.cn_nameptr, no_firmlink_path, MAXPATHLEN, &truncated_no_firmlink_path);
+#if CONFIG_FSE
+ if (truncated_no_firmlink_path) {
+ finfo.mode |= FSE_TRUNCATED_PATH;
+ }
+#endif
+ }
+
+ error = vn_rmdir(dvp, &vp, &nd, vap, ctx);
+ nd.ni_vp = vp;
+ if (vp == NULLVP) {
+ /* Couldn't find a vnode */
+ goto out;
+ }
+
+ if (error == EKEEPLOOKING) {
+ goto continue_lookup;
+ } else if (batched && error == ENOENT) {
+ if (restart_count < MAX_AUTHORIZE_ENOENT_RETRIES) {
+ /*
+ * For compound VNOPs, the authorization callback
+ * may return ENOENT in case of racing hard link lookups
+ * redrive the lookup.
+ */
+ restart_flag = 1;
+ restart_count += 1;
+ goto out;
+ }
+ }
+
+ /*
+ * XXX There's no provision for passing flags
+ * to VNOP_RMDIR(). So, if vn_rmdir() fails
+ * because it's not empty, then we try again
+ * with VNOP_REMOVE(), passing in a special
+ * flag that clever file systems will know
+ * how to handle.
+ */
+ if (error == ENOTEMPTY &&
+ (unlink_flags & VNODE_REMOVE_DATALESS_DIR) != 0) {
+ /*
+ * If this fails, we want to keep the original
+ * error.
+ */
+ if (vn_remove(dvp, &vp, &nd,
+ VNODE_REMOVE_DATALESS_DIR, vap, ctx) == 0) {
+ error = 0;
+ }
+ }
+
+#if CONFIG_APPLEDOUBLE
+ /*
+ * Special case to remove orphaned AppleDouble
+ * files. I don't like putting this in the kernel,
+ * but carbon does not like putting this in carbon either,
+ * so here we are.
+ */
+ if (error == ENOTEMPTY) {
+ int ad_error = rmdir_remove_orphaned_appleDouble(vp, ctx, &restart_flag);
+ if (ad_error == EBUSY) {
+ error = ad_error;
+ goto out;
+ }
+
+
+ /*
+ * Assuming everything went well, we will try the RMDIR again
+ */
+ if (!ad_error) {
+ error = vn_rmdir(dvp, &vp, &nd, vap, ctx);
+ }
+ }
+#endif /* CONFIG_APPLEDOUBLE */
+ /*
+ * Call out to allow 3rd party notification of delete.
+ * Ignore result of kauth_authorize_fileop call.
+ */
+ if (!error) {
+ if (has_listeners) {
+ kauth_authorize_fileop(vfs_context_ucred(ctx),
+ KAUTH_FILEOP_DELETE,
+ (uintptr_t)vp,
+ (uintptr_t)path);
+ }
+
+ if (vp->v_flag & VISHARDLINK) {
+ // see the comment in unlink1() about why we update
+ // the parent of a hard link when it is removed
+ vnode_update_identity(vp, NULL, NULL, 0, 0, VNODE_UPDATE_PARENT);
+ }
+
+#if CONFIG_FSE
+ if (need_event) {
+ if (vap) {
+ vnode_get_fse_info_from_vap(vp, &finfo, vap);
+ }
+ add_fsevent(FSE_DELETE, ctx,
+ FSE_ARG_STRING, len_no_firmlink_path, no_firmlink_path,
+ FSE_ARG_FINFO, &finfo,
+ FSE_ARG_DONE);
+ }
+#endif
+ }
+
+out:
+ if (path != NULL) {
+ RELEASE_PATH(path);
+ path = NULL;
+ }
+
+ if (no_firmlink_path != NULL) {
+ RELEASE_PATH(no_firmlink_path);
+ no_firmlink_path = NULL;
+ }
+
+ /*
+ * nameidone has to happen before we vnode_put(dvp)
+ * since it may need to release the fs_nodelock on the dvp
+ */
+ nameidone(&nd);
+ vnode_put(dvp);
+
+ if (vp) {
+ vnode_put(vp);
+ }
+
+ if (restart_flag == 0) {
+ wakeup_one((caddr_t)vp);
+ return error;
+ }
+ tsleep(vp, PVFS, "rm AD", 1);
+ } while (restart_flag != 0);
+
+ return error;
+}
+
+/*
+ * Remove a directory file.
+ */
+/* ARGSUSED */
+int
+rmdir(__unused proc_t p, struct rmdir_args *uap, __unused int32_t *retval)
+{
+ return rmdirat_internal(vfs_context_current(), AT_FDCWD,
+ CAST_USER_ADDR_T(uap->path), UIO_USERSPACE, 0);
+}
+
+/* Get direntry length padded to 8 byte alignment */
+#define DIRENT64_LEN(namlen) \
+ ((sizeof(struct direntry) + (namlen) - (MAXPATHLEN-1) + 7) & ~7)
+
+/* Get dirent length padded to 4 byte alignment */
+#define DIRENT_LEN(namelen) \
+ ((sizeof(struct dirent) + (namelen + 1) - (__DARWIN_MAXNAMLEN + 1) + 3) & ~3)
+
+/* Get the end of this dirent */
+#define DIRENT_END(dep) \
+ (((char *)(dep)) + (dep)->d_reclen - 1)
+
+errno_t
+vnode_readdir64(struct vnode *vp, struct uio *uio, int flags, int *eofflag,
+ int *numdirent, vfs_context_t ctxp)
+{
+ /* Check if fs natively supports VNODE_READDIR_EXTENDED */
+ if ((vp->v_mount->mnt_vtable->vfc_vfsflags & VFC_VFSREADDIR_EXTENDED) &&
+ ((vp->v_mount->mnt_kern_flag & MNTK_DENY_READDIREXT) == 0)) {
+ return VNOP_READDIR(vp, uio, flags, eofflag, numdirent, ctxp);
+ } else {
+ size_t bufsize;
+ void * bufptr;
+ uio_t auio;
+ struct direntry *entry64;
+ struct dirent *dep;
+ size_t bytesread;
+ int error;
+
+ /*
+ * We're here because the underlying file system does not
+ * support direnties or we mounted denying support so we must
+ * fall back to dirents and convert them to direntries.
+ *
+ * Our kernel buffer needs to be smaller since re-packing will
+ * expand each dirent. The worse case (when the name length
+ * is 3 or less) corresponds to a struct direntry size of 32
+ * bytes (8-byte aligned) and a struct dirent size of 12 bytes
+ * (4-byte aligned). So having a buffer that is 3/8 the size
+ * will prevent us from reading more than we can pack.
+ *
+ * Since this buffer is wired memory, we will limit the
+ * buffer size to a maximum of 32K. We would really like to
+ * use 32K in the MIN(), but we use magic number 87371 to
+ * prevent uio_resid() * 3 / 8 from overflowing.
+ */
+ bufsize = 3 * MIN((user_size_t)uio_resid(uio), 87371u) / 8;
+ bufptr = kheap_alloc(KHEAP_DATA_BUFFERS, bufsize, Z_WAITOK);
+ if (bufptr == NULL) {
+ return ENOMEM;
+ }
+
+ auio = uio_create(1, 0, UIO_SYSSPACE, UIO_READ);
+ uio_addiov(auio, (uintptr_t)bufptr, bufsize);
+ auio->uio_offset = uio->uio_offset;
error = VNOP_READDIR(vp, auio, 0, eofflag, numdirent, ctxp);
- dep = (struct dirent *)bufptr;
- bytesread = bufsize - uio_resid(auio);
+ dep = (struct dirent *)bufptr;
+ bytesread = bufsize - uio_resid(auio);
+
+ entry64 = kheap_alloc(KHEAP_TEMP, sizeof(struct direntry), Z_WAITOK);
+ /*
+ * Convert all the entries and copy them out to user's buffer.
+ */
+ while (error == 0 && (char *)dep < ((char *)bufptr + bytesread)) {
+ /* First check that the dirent struct up to d_name is within the buffer */
+ if ((char*)dep + offsetof(struct dirent, d_name) > ((char *)bufptr + bytesread) ||
+ /* Check that the length of the entire dirent is within the buffer */
+ DIRENT_END(dep) > ((char *)bufptr + bytesread) ||
+ /* Check that the actual length including the name doesn't exceed d_reclen */
+ DIRENT_LEN(dep->d_namlen) > dep->d_reclen) {
+ printf("%s: %s: Bad dirent recived from directory %s\n", __func__,
+ vp->v_mount->mnt_vfsstat.f_mntonname,
+ vp->v_name ? vp->v_name : "<unknown>");
+ error = EIO;
+ break;
+ }
+
+ size_t enbufsize = DIRENT64_LEN(dep->d_namlen);
+
+ bzero(entry64, enbufsize);
+ /* Convert a dirent to a dirent64. */
+ entry64->d_ino = dep->d_ino;
+ entry64->d_seekoff = 0;
+ entry64->d_reclen = (uint16_t)enbufsize;
+ entry64->d_namlen = dep->d_namlen;
+ entry64->d_type = dep->d_type;
+ bcopy(dep->d_name, entry64->d_name, dep->d_namlen + 1);
+
+ /* Move to next entry. */
+ dep = (struct dirent *)((char *)dep + dep->d_reclen);
+
+ /* Copy entry64 to user's buffer. */
+ error = uiomove((caddr_t)entry64, entry64->d_reclen, uio);
+ }
+
+ /* Update the real offset using the offset we got from VNOP_READDIR. */
+ if (error == 0) {
+ uio->uio_offset = auio->uio_offset;
+ }
+ uio_free(auio);
+ kheap_free(KHEAP_DATA_BUFFERS, bufptr, bufsize);
+ kheap_free(KHEAP_TEMP, entry64, sizeof(struct direntry));
+ return error;
+ }
+}
+
+#define GETDIRENTRIES_MAXBUFSIZE (128 * 1024 * 1024U)
+
+/*
+ * Read a block of directory entries in a file system independent format.
+ */
+static int
+getdirentries_common(int fd, user_addr_t bufp, user_size_t bufsize, ssize_t *bytesread,
+ off_t *offset, int *eofflag, int flags)
+{
+ vnode_t vp;
+ struct vfs_context context = *vfs_context_current(); /* local copy */
+ struct fileproc *fp;
+ uio_t auio;
+ int spacetype = proc_is64bit(vfs_context_proc(&context)) ? UIO_USERSPACE64 : UIO_USERSPACE32;
+ off_t loff;
+ int error, numdirent;
+ char uio_buf[UIO_SIZEOF(1)];
+
+ error = fp_getfvp(vfs_context_proc(&context), fd, &fp, &vp);
+ if (error) {
+ return error;
+ }
+ if ((fp->fp_glob->fg_flag & FREAD) == 0) {
+ AUDIT_ARG(vnpath_withref, vp, ARG_VNODE1);
+ error = EBADF;
+ goto out;
+ }
+
+ if (bufsize > GETDIRENTRIES_MAXBUFSIZE) {
+ bufsize = GETDIRENTRIES_MAXBUFSIZE;
+ }
+
+#if CONFIG_MACF
+ error = mac_file_check_change_offset(vfs_context_ucred(&context), fp->fp_glob);
+ if (error) {
+ goto out;
+ }
+#endif
+ if ((error = vnode_getwithref(vp))) {
+ goto out;
+ }
+ AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+
+unionread:
+ if (vp->v_type != VDIR) {
+ (void)vnode_put(vp);
+ error = EINVAL;
+ goto out;
+ }
+
+#if CONFIG_MACF
+ error = mac_vnode_check_readdir(&context, vp);
+ if (error != 0) {
+ (void)vnode_put(vp);
+ goto out;
+ }
+#endif /* MAC */
+
+ loff = fp->fp_glob->fg_offset;
+ auio = uio_createwithbuffer(1, loff, spacetype, UIO_READ, &uio_buf[0], sizeof(uio_buf));
+ uio_addiov(auio, bufp, bufsize);
+
+ if (flags & VNODE_READDIR_EXTENDED) {
+ error = vnode_readdir64(vp, auio, flags, eofflag, &numdirent, &context);
+ fp->fp_glob->fg_offset = uio_offset(auio);
+ } else {
+ error = VNOP_READDIR(vp, auio, 0, eofflag, &numdirent, &context);
+ fp->fp_glob->fg_offset = uio_offset(auio);
+ }
+ if (error) {
+ (void)vnode_put(vp);
+ goto out;
+ }
+
+ if ((user_ssize_t)bufsize == uio_resid(auio)) {
+ if ((vp->v_mount->mnt_flag & MNT_UNION)) {
+ struct vnode *tvp = vp;
+ if (lookup_traverse_union(tvp, &vp, &context) == 0) {
+ vnode_ref(vp);
+ fp->fp_glob->fg_data = (caddr_t) vp;
+ fp->fp_glob->fg_offset = 0;
+ vnode_rele(tvp);
+ vnode_put(tvp);
+ goto unionread;
+ }
+ vp = tvp;
+ }
+ }
+
+ vnode_put(vp);
+ if (offset) {
+ *offset = loff;
+ }
+
+ *bytesread = bufsize - uio_resid(auio);
+out:
+ file_drop(fd);
+ return error;
+}
+
+
+int
+getdirentries(__unused struct proc *p, struct getdirentries_args *uap, int32_t *retval)
+{
+ off_t offset;
+ ssize_t bytesread;
+ int error, eofflag;
+
+ AUDIT_ARG(fd, uap->fd);
+ error = getdirentries_common(uap->fd, uap->buf, uap->count,
+ &bytesread, &offset, &eofflag, 0);
+
+ if (error == 0) {
+ if (proc_is64bit(p)) {
+ user64_long_t base = (user64_long_t)offset;
+ error = copyout((caddr_t)&base, uap->basep, sizeof(user64_long_t));
+ } else {
+ user32_long_t base = (user32_long_t)offset;
+ error = copyout((caddr_t)&base, uap->basep, sizeof(user32_long_t));
+ }
+ *retval = (int)bytesread;
+ }
+ return error;
+}
+
+int
+getdirentries64(__unused struct proc *p, struct getdirentries64_args *uap, user_ssize_t *retval)
+{
+ off_t offset;
+ ssize_t bytesread;
+ int error, eofflag;
+ user_size_t bufsize;
+
+ AUDIT_ARG(fd, uap->fd);
+
+ /*
+ * If the buffer is at least GETDIRENTRIES64_EXTENDED_BUFSIZE large,
+ * then the kernel carves out the last 4 bytes to return extended
+ * information to userspace (namely whether we reached EOF with this call).
+ */
+ if (uap->bufsize >= GETDIRENTRIES64_EXTENDED_BUFSIZE) {
+ bufsize = uap->bufsize - sizeof(getdirentries64_flags_t);
+ } else {
+ bufsize = uap->bufsize;
+ }
+
+ error = getdirentries_common(uap->fd, uap->buf, bufsize,
+ &bytesread, &offset, &eofflag, VNODE_READDIR_EXTENDED);
+
+ if (error == 0) {
+ *retval = bytesread;
+ error = copyout((caddr_t)&offset, uap->position, sizeof(off_t));
+
+ if (error == 0 && uap->bufsize >= GETDIRENTRIES64_EXTENDED_BUFSIZE) {
+ getdirentries64_flags_t flags = 0;
+ if (eofflag) {
+ flags |= GETDIRENTRIES64_EOF;
+ }
+ error = copyout(&flags, (user_addr_t)uap->buf + bufsize,
+ sizeof(flags));
+ }
+ }
+ return error;
+}
+
+
+/*
+ * Set the mode mask for creation of filesystem nodes.
+ * XXX implement xsecurity
+ */
+#define UMASK_NOXSECURITY (void *)1 /* leave existing xsecurity alone */
+static int
+umask1(proc_t p, int newmask, __unused kauth_filesec_t fsec, int32_t *retval)
+{
+ struct filedesc *fdp;
+
+ AUDIT_ARG(mask, newmask);
+ proc_fdlock(p);
+ fdp = p->p_fd;
+ *retval = fdp->fd_cmask;
+ fdp->fd_cmask = newmask & ALLPERMS;
+ proc_fdunlock(p);
+ return 0;
+}
+
+/*
+ * umask_extended: Set the mode mask for creation of filesystem nodes; with extended security (ACL).
+ *
+ * Parameters: p Process requesting to set the umask
+ * uap User argument descriptor (see below)
+ * retval umask of the process (parameter p)
+ *
+ * Indirect: uap->newmask umask to set
+ * uap->xsecurity ACL to set
+ *
+ * Returns: 0 Success
+ * !0 Not success
+ *
+ */
+int
+umask_extended(proc_t p, struct umask_extended_args *uap, int32_t *retval)
+{
+ int ciferror;
+ kauth_filesec_t xsecdst;
+
+ xsecdst = KAUTH_FILESEC_NONE;
+ if (uap->xsecurity != USER_ADDR_NULL) {
+ if ((ciferror = kauth_copyinfilesec(uap->xsecurity, &xsecdst)) != 0) {
+ return ciferror;
+ }
+ } else {
+ xsecdst = KAUTH_FILESEC_NONE;
+ }
+
+ ciferror = umask1(p, uap->newmask, xsecdst, retval);
+
+ if (xsecdst != KAUTH_FILESEC_NONE) {
+ kauth_filesec_free(xsecdst);
+ }
+ return ciferror;
+}
+
+int
+umask(proc_t p, struct umask_args *uap, int32_t *retval)
+{
+ return umask1(p, uap->newmask, UMASK_NOXSECURITY, retval);
+}
+
+/*
+ * Void all references to file by ripping underlying filesystem
+ * away from vnode.
+ */
+/* ARGSUSED */
+int
+revoke(proc_t p, struct revoke_args *uap, __unused int32_t *retval)
+{
+ vnode_t vp;
+ struct vnode_attr va;
+ vfs_context_t ctx = vfs_context_current();
+ int error;
+ struct nameidata nd;
+
+ NDINIT(&nd, LOOKUP, OP_REVOKE, FOLLOW | AUDITVNPATH1, UIO_USERSPACE,
+ uap->path, ctx);
+ error = namei(&nd);
+ if (error) {
+ return error;
+ }
+ vp = nd.ni_vp;
+
+ nameidone(&nd);
+
+ if (!(vnode_ischr(vp) || vnode_isblk(vp))) {
+ error = ENOTSUP;
+ goto out;
+ }
+
+ if (vnode_isblk(vp) && vnode_ismountedon(vp)) {
+ error = EBUSY;
+ goto out;
+ }
+
+#if CONFIG_MACF
+ error = mac_vnode_check_revoke(ctx, vp);
+ if (error) {
+ goto out;
+ }
+#endif
+
+ VATTR_INIT(&va);
+ VATTR_WANTED(&va, va_uid);
+ if ((error = vnode_getattr(vp, &va, ctx))) {
+ goto out;
+ }
+ if (kauth_cred_getuid(vfs_context_ucred(ctx)) != va.va_uid &&
+ (error = suser(vfs_context_ucred(ctx), &p->p_acflag))) {
+ goto out;
+ }
+ if (vp->v_usecount > 0 || (vnode_isaliased(vp))) {
+ VNOP_REVOKE(vp, REVOKEALL, ctx);
+ }
+out:
+ vnode_put(vp);
+ return error;
+}
+
+
+/*
+ * HFS/HFS PlUS SPECIFIC SYSTEM CALLS
+ * The following system calls are designed to support features
+ * which are specific to the HFS & HFS Plus volume formats
+ */
+
+
+/*
+ * Obtain attribute information on objects in a directory while enumerating
+ * the directory.
+ */
+/* ARGSUSED */
+int
+getdirentriesattr(proc_t p, struct getdirentriesattr_args *uap, int32_t *retval)
+{
+ vnode_t vp;
+ struct fileproc *fp;
+ uio_t auio = NULL;
+ int spacetype = proc_is64bit(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
+ uint32_t count = 0, savecount = 0;
+ uint32_t newstate = 0;
+ int error, eofflag;
+ off_t loff = 0;
+ struct attrlist attributelist;
+ vfs_context_t ctx = vfs_context_current();
+ int fd = uap->fd;
+ char uio_buf[UIO_SIZEOF(1)];
+ kauth_action_t action;
+
+ AUDIT_ARG(fd, fd);
+
+ /* Get the attributes into kernel space */
+ if ((error = copyin(uap->alist, (caddr_t)&attributelist, sizeof(attributelist)))) {
+ return error;
+ }
+ if ((error = copyin(uap->count, (caddr_t)&count, sizeof(count)))) {
+ return error;
+ }
+ savecount = count;
+ if ((error = fp_getfvp(p, fd, &fp, &vp))) {
+ return error;
+ }
+ if ((fp->fp_glob->fg_flag & FREAD) == 0) {
+ AUDIT_ARG(vnpath_withref, vp, ARG_VNODE1);
+ error = EBADF;
+ goto out;
+ }
+
+
+#if CONFIG_MACF
+ error = mac_file_check_change_offset(vfs_context_ucred(ctx),
+ fp->fp_glob);
+ if (error) {
+ goto out;
+ }
+#endif
+
+
+ if ((error = vnode_getwithref(vp))) {
+ goto out;
+ }
+
+ AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+
+unionread:
+ if (vp->v_type != VDIR) {
+ (void)vnode_put(vp);
+ error = EINVAL;
+ goto out;
+ }
+
+#if CONFIG_MACF
+ error = mac_vnode_check_readdir(ctx, vp);
+ if (error != 0) {
+ (void)vnode_put(vp);
+ goto out;
+ }
+#endif /* MAC */
+
+ /* set up the uio structure which will contain the users return buffer */
+ loff = fp->fp_glob->fg_offset;
+ auio = uio_createwithbuffer(1, loff, spacetype, UIO_READ, &uio_buf[0], sizeof(uio_buf));
+ uio_addiov(auio, uap->buffer, uap->buffersize);
+
+ /*
+ * If the only item requested is file names, we can let that past with
+ * just LIST_DIRECTORY. If they want any other attributes, that means
+ * they need SEARCH as well.
+ */
+ action = KAUTH_VNODE_LIST_DIRECTORY;
+ if ((attributelist.commonattr & ~ATTR_CMN_NAME) ||
+ attributelist.fileattr || attributelist.dirattr) {
+ action |= KAUTH_VNODE_SEARCH;
+ }
+
+ if ((error = vnode_authorize(vp, NULL, action, ctx)) == 0) {
+ /* Believe it or not, uap->options only has 32-bits of valid
+ * info, so truncate before extending again */
+
+ error = VNOP_READDIRATTR(vp, &attributelist, auio, count,
+ (uint32_t)uap->options, &newstate, &eofflag, &count, ctx);
+ }
+
+ if (error) {
+ (void) vnode_put(vp);
+ goto out;
+ }
+
+ /*
+ * If we've got the last entry of a directory in a union mount
+ * then reset the eofflag and pretend there's still more to come.
+ * The next call will again set eofflag and the buffer will be empty,
+ * so traverse to the underlying directory and do the directory
+ * read there.
+ */
+ if (eofflag && vp->v_mount->mnt_flag & MNT_UNION) {
+ if (uio_resid(auio) < (user_ssize_t) uap->buffersize) { // Got some entries
+ eofflag = 0;
+ } else { // Empty buffer
+ struct vnode *tvp = vp;
+ if (lookup_traverse_union(tvp, &vp, ctx) == 0) {
+ vnode_ref_ext(vp, fp->fp_glob->fg_flag & O_EVTONLY, 0);
+ fp->fp_glob->fg_data = (caddr_t) vp;
+ fp->fp_glob->fg_offset = 0; // reset index for new dir
+ count = savecount;
+ vnode_rele_internal(tvp, fp->fp_glob->fg_flag & O_EVTONLY, 0, 0);
+ vnode_put(tvp);
+ goto unionread;
+ }
+ vp = tvp;
+ }
+ }
+
+ (void)vnode_put(vp);
+
+ if (error) {
+ goto out;
+ }
+ fp->fp_glob->fg_offset = uio_offset(auio); /* should be multiple of dirent, not variable */
+
+ if ((error = copyout((caddr_t) &count, uap->count, sizeof(count)))) {
+ goto out;
+ }
+ if ((error = copyout((caddr_t) &newstate, uap->newstate, sizeof(newstate)))) {
+ goto out;
+ }
+ if ((error = copyout((caddr_t) &loff, uap->basep, sizeof(loff)))) {
+ goto out;
+ }
+
+ *retval = eofflag; /* similar to getdirentries */
+ error = 0;
+out:
+ file_drop(fd);
+ return error; /* return error earlier, an retval of 0 or 1 now */
+} /* end of getdirentriesattr system call */
+
+/*
+ * Exchange data between two files
+ */
+
+/* ARGSUSED */
+int
+exchangedata(__unused proc_t p, struct exchangedata_args *uap, __unused int32_t *retval)
+{
+ struct nameidata fnd, snd;
+ vfs_context_t ctx = vfs_context_current();
+ vnode_t fvp;
+ vnode_t svp;
+ int error;
+ u_int32_t nameiflags;
+ char *fpath = NULL;
+ char *spath = NULL;
+ int flen = 0, slen = 0;
+ int from_truncated = 0, to_truncated = 0;
+#if CONFIG_FSE
+ fse_info f_finfo, s_finfo;
+#endif
+
+ nameiflags = 0;
+ if ((uap->options & FSOPT_NOFOLLOW) == 0) {
+ nameiflags |= FOLLOW;
+ }
+
+ NDINIT(&fnd, LOOKUP, OP_EXCHANGEDATA, nameiflags | AUDITVNPATH1,
+ UIO_USERSPACE, uap->path1, ctx);
+
+ error = namei(&fnd);
+ if (error) {
+ goto out2;
+ }
+
+ nameidone(&fnd);
+ fvp = fnd.ni_vp;
+
+ NDINIT(&snd, LOOKUP, OP_EXCHANGEDATA, CN_NBMOUNTLOOK | nameiflags | AUDITVNPATH2,
+ UIO_USERSPACE, uap->path2, ctx);
+
+ error = namei(&snd);
+ if (error) {
+ vnode_put(fvp);
+ goto out2;
+ }
+ nameidone(&snd);
+ svp = snd.ni_vp;
+
+ /*
+ * if the files are the same, return an inval error
+ */
+ if (svp == fvp) {
+ error = EINVAL;
+ goto out;
+ }
+
+ /*
+ * if the files are on different volumes, return an error
+ */
+ if (svp->v_mount != fvp->v_mount) {
+ error = EXDEV;
+ goto out;
+ }
+
+ /* If they're not files, return an error */
+ if ((vnode_isreg(fvp) == 0) || (vnode_isreg(svp) == 0)) {
+ error = EINVAL;
+ goto out;
+ }
+
+#if CONFIG_MACF
+ error = mac_vnode_check_exchangedata(ctx,
+ fvp, svp);
+ if (error) {
+ goto out;
+ }
+#endif
+ if (((error = vnode_authorize(fvp, NULL, KAUTH_VNODE_READ_DATA | KAUTH_VNODE_WRITE_DATA, ctx)) != 0) ||
+ ((error = vnode_authorize(svp, NULL, KAUTH_VNODE_READ_DATA | KAUTH_VNODE_WRITE_DATA, ctx)) != 0)) {
+ goto out;
+ }
+
+ if (
+#if CONFIG_FSE
+ need_fsevent(FSE_EXCHANGE, fvp) ||
+#endif
+ kauth_authorize_fileop_has_listeners()) {
+ GET_PATH(fpath);
+ GET_PATH(spath);
+
+ flen = safe_getpath(fvp, NULL, fpath, MAXPATHLEN, &from_truncated);
+ slen = safe_getpath(svp, NULL, spath, MAXPATHLEN, &to_truncated);
+
+#if CONFIG_FSE
+ get_fse_info(fvp, &f_finfo, ctx);
+ get_fse_info(svp, &s_finfo, ctx);
+ if (from_truncated || to_truncated) {
+ // set it here since only the f_finfo gets reported up to user space
+ f_finfo.mode |= FSE_TRUNCATED_PATH;
+ }
+#endif
+ }
+ /* Ok, make the call */
+ error = VNOP_EXCHANGE(fvp, svp, 0, ctx);
+
+ if (error == 0) {
+ const char *tmpname;
+
+ if (fpath != NULL && spath != NULL) {
+ /* call out to allow 3rd party notification of exchangedata.
+ * Ignore result of kauth_authorize_fileop call.
+ */
+ kauth_authorize_fileop(vfs_context_ucred(ctx), KAUTH_FILEOP_EXCHANGE,
+ (uintptr_t)fpath, (uintptr_t)spath);
+ }
+ name_cache_lock();
+
+ tmpname = fvp->v_name;
+ fvp->v_name = svp->v_name;
+ svp->v_name = tmpname;
+
+ if (fvp->v_parent != svp->v_parent) {
+ vnode_t tmp;
+
+ tmp = fvp->v_parent;
+ fvp->v_parent = svp->v_parent;
+ svp->v_parent = tmp;
+ }
+ name_cache_unlock();
+
+#if CONFIG_FSE
+ if (fpath != NULL && spath != NULL) {
+ add_fsevent(FSE_EXCHANGE, ctx,
+ FSE_ARG_STRING, flen, fpath,
+ FSE_ARG_FINFO, &f_finfo,
+ FSE_ARG_STRING, slen, spath,
+ FSE_ARG_FINFO, &s_finfo,
+ FSE_ARG_DONE);
+ }
+#endif
+ }
+
+out:
+ if (fpath != NULL) {
+ RELEASE_PATH(fpath);
+ }
+ if (spath != NULL) {
+ RELEASE_PATH(spath);
+ }
+ vnode_put(svp);
+ vnode_put(fvp);
+out2:
+ return error;
+}
+
+/*
+ * Return (in MB) the amount of freespace on the given vnode's volume.
+ */
+uint32_t freespace_mb(vnode_t vp);
+
+uint32_t
+freespace_mb(vnode_t vp)
+{
+ vfs_update_vfsstat(vp->v_mount, vfs_context_current(), VFS_USER_EVENT);
+ return (uint32_t)(((uint64_t)vp->v_mount->mnt_vfsstat.f_bavail *
+ vp->v_mount->mnt_vfsstat.f_bsize) >> 20);
+}
+
+#if CONFIG_SEARCHFS
+
+/* ARGSUSED */
+
+int
+searchfs(proc_t p, struct searchfs_args *uap, __unused int32_t *retval)
+{
+ vnode_t vp, tvp;
+ int i, error = 0;
+ int fserror = 0;
+ struct nameidata nd;
+ struct user64_fssearchblock searchblock;
+ struct searchstate *state;
+ struct attrlist *returnattrs;
+ struct timeval timelimit;
+ void *searchparams1, *searchparams2;
+ uio_t auio = NULL;
+ int spacetype = proc_is64bit(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
+ uint32_t nummatches;
+ size_t mallocsize;
+ uint32_t nameiflags;
+ vfs_context_t ctx = vfs_context_current();
+ char uio_buf[UIO_SIZEOF(1)];
+
+ /* Start by copying in fsearchblock parameter list */
+ if (IS_64BIT_PROCESS(p)) {
+ error = copyin(uap->searchblock, (caddr_t) &searchblock, sizeof(searchblock));
+ timelimit.tv_sec = searchblock.timelimit.tv_sec;
+ timelimit.tv_usec = searchblock.timelimit.tv_usec;
+ } else {
+ struct user32_fssearchblock tmp_searchblock;
+
+ error = copyin(uap->searchblock, (caddr_t) &tmp_searchblock, sizeof(tmp_searchblock));
+ // munge into 64-bit version
+ searchblock.returnattrs = CAST_USER_ADDR_T(tmp_searchblock.returnattrs);
+ searchblock.returnbuffer = CAST_USER_ADDR_T(tmp_searchblock.returnbuffer);
+ searchblock.returnbuffersize = tmp_searchblock.returnbuffersize;
+ searchblock.maxmatches = tmp_searchblock.maxmatches;
+ /*
+ * These casts are safe. We will promote the tv_sec into a 64 bit long if necessary
+ * from a 32 bit long, and tv_usec is already a signed 32 bit int.
+ */
+ timelimit.tv_sec = (__darwin_time_t) tmp_searchblock.timelimit.tv_sec;
+ timelimit.tv_usec = (__darwin_useconds_t) tmp_searchblock.timelimit.tv_usec;
+ searchblock.searchparams1 = CAST_USER_ADDR_T(tmp_searchblock.searchparams1);
+ searchblock.sizeofsearchparams1 = tmp_searchblock.sizeofsearchparams1;
+ searchblock.searchparams2 = CAST_USER_ADDR_T(tmp_searchblock.searchparams2);
+ searchblock.sizeofsearchparams2 = tmp_searchblock.sizeofsearchparams2;
+ searchblock.searchattrs = tmp_searchblock.searchattrs;
+ }
+ if (error) {
+ return error;
+ }
+
+ /* Do a sanity check on sizeofsearchparams1 and sizeofsearchparams2.
+ */
+ if (searchblock.sizeofsearchparams1 > SEARCHFS_MAX_SEARCHPARMS ||
+ searchblock.sizeofsearchparams2 > SEARCHFS_MAX_SEARCHPARMS) {
+ return EINVAL;
+ }
+
+ /* Now malloc a big bunch of space to hold the search parameters, the attrlists and the search state. */
+ /* It all has to do into local memory and it's not that big so we might as well put it all together. */
+ /* Searchparams1 shall be first so we might as well use that to hold the base address of the allocated*/
+ /* block. */
+ /* */
+ /* NOTE: we allocate an extra 8 bytes to account for the difference in size of the searchstate */
+ /* due to the changes in rdar://problem/12438273. That way if a 3rd party file system */
+ /* assumes the size is still 556 bytes it will continue to work */
+
+ mallocsize = searchblock.sizeofsearchparams1 + searchblock.sizeofsearchparams2 +
+ sizeof(struct attrlist) + sizeof(struct searchstate) + (2 * sizeof(uint32_t));
+
+ searchparams1 = kheap_alloc(KHEAP_DATA_BUFFERS, mallocsize, Z_WAITOK);
+
+ /* Now set up the various pointers to the correct place in our newly allocated memory */
+
+ searchparams2 = (void *) (((caddr_t) searchparams1) + searchblock.sizeofsearchparams1);
+ returnattrs = (struct attrlist *) (((caddr_t) searchparams2) + searchblock.sizeofsearchparams2);
+ state = (struct searchstate *) (((caddr_t) returnattrs) + sizeof(struct attrlist));
+
+ /* Now copy in the stuff given our local variables. */
+
+ if ((error = copyin(searchblock.searchparams1, searchparams1, searchblock.sizeofsearchparams1))) {
+ goto freeandexit;
+ }
+
+ if ((error = copyin(searchblock.searchparams2, searchparams2, searchblock.sizeofsearchparams2))) {
+ goto freeandexit;
+ }
+
+ if ((error = copyin(searchblock.returnattrs, (caddr_t) returnattrs, sizeof(struct attrlist)))) {
+ goto freeandexit;
+ }
+
+ if ((error = copyin(uap->state, (caddr_t) state, sizeof(struct searchstate)))) {
+ goto freeandexit;
+ }
+
+ /*
+ * When searching a union mount, need to set the
+ * start flag at the first call on each layer to
+ * reset state for the new volume.
+ */
+ if (uap->options & SRCHFS_START) {
+ state->ss_union_layer = 0;
+ } else {
+ uap->options |= state->ss_union_flags;
+ }
+ state->ss_union_flags = 0;
+
+ /*
+ * Because searchparams1 and searchparams2 may contain an ATTR_CMN_NAME search parameter,
+ * which is passed in with an attrreference_t, we need to inspect the buffer manually here.
+ * The KPI does not provide us the ability to pass in the length of the buffers searchparams1
+ * and searchparams2. To obviate the need for all searchfs-supporting filesystems to
+ * validate the user-supplied data offset of the attrreference_t, we'll do it here.
+ */
+
+ if (searchblock.searchattrs.commonattr & ATTR_CMN_NAME) {
+ attrreference_t* string_ref;
+ u_int32_t* start_length;
+ user64_size_t param_length;
+
+ /* validate searchparams1 */
+ param_length = searchblock.sizeofsearchparams1;
+ /* skip the word that specifies length of the buffer */
+ start_length = (u_int32_t*) searchparams1;
+ start_length = start_length + 1;
+ string_ref = (attrreference_t*) start_length;
+
+ /* ensure no negative offsets or too big offsets */
+ if (string_ref->attr_dataoffset < 0) {
+ error = EINVAL;
+ goto freeandexit;
+ }
+ if (string_ref->attr_length > MAXPATHLEN) {
+ error = EINVAL;
+ goto freeandexit;
+ }
+
+ /* Check for pointer overflow in the string ref */
+ if (((char*) string_ref + string_ref->attr_dataoffset) < (char*) string_ref) {
+ error = EINVAL;
+ goto freeandexit;
+ }
+
+ if (((char*) string_ref + string_ref->attr_dataoffset) > ((char*)searchparams1 + param_length)) {
+ error = EINVAL;
+ goto freeandexit;
+ }
+ if (((char*)string_ref + string_ref->attr_dataoffset + string_ref->attr_length) > ((char*)searchparams1 + param_length)) {
+ error = EINVAL;
+ goto freeandexit;
+ }
+ }
+
+ /* set up the uio structure which will contain the users return buffer */
+ auio = uio_createwithbuffer(1, 0, spacetype, UIO_READ, &uio_buf[0], sizeof(uio_buf));
+ uio_addiov(auio, searchblock.returnbuffer, searchblock.returnbuffersize);
+
+ nameiflags = 0;
+ if ((uap->options & FSOPT_NOFOLLOW) == 0) {
+ nameiflags |= FOLLOW;
+ }
+ NDINIT(&nd, LOOKUP, OP_SEARCHFS, nameiflags | AUDITVNPATH1,
+ UIO_USERSPACE, uap->path, ctx);
+
+ error = namei(&nd);
+ if (error) {
+ goto freeandexit;
+ }
+ vp = nd.ni_vp;
+ nameidone(&nd);
+
+ /*
+ * Switch to the root vnode for the volume
+ */
+ error = VFS_ROOT(vnode_mount(vp), &tvp, ctx);
+ vnode_put(vp);
+ if (error) {
+ goto freeandexit;
+ }
+ vp = tvp;
+
+ /*
+ * If it's a union mount, the path lookup takes
+ * us to the top layer. But we may need to descend
+ * to a lower layer. For non-union mounts the layer
+ * is always zero.
+ */
+ for (i = 0; i < (int) state->ss_union_layer; i++) {
+ if ((vp->v_mount->mnt_flag & MNT_UNION) == 0) {
+ break;
+ }
+ tvp = vp;
+ vp = vp->v_mount->mnt_vnodecovered;
+ if (vp == NULL) {
+ vnode_put(tvp);
+ error = ENOENT;
+ goto freeandexit;
+ }
+ error = vnode_getwithref(vp);
+ vnode_put(tvp);
+ if (error) {
+ goto freeandexit;
+ }
+ }
+
+#if CONFIG_MACF
+ error = mac_vnode_check_searchfs(ctx, vp, &searchblock.searchattrs);
+ if (error) {
+ vnode_put(vp);
+ goto freeandexit;
+ }
+#endif
+
+
+ /*
+ * If searchblock.maxmatches == 0, then skip the search. This has happened
+ * before and sometimes the underlying code doesnt deal with it well.
+ */
+ if (searchblock.maxmatches == 0) {
+ nummatches = 0;
+ goto saveandexit;
+ }
+
+ /*
+ * Allright, we have everything we need, so lets make that call.
+ *
+ * We keep special track of the return value from the file system:
+ * EAGAIN is an acceptable error condition that shouldn't keep us
+ * from copying out any results...
+ */
+
+ fserror = VNOP_SEARCHFS(vp,
+ searchparams1,
+ searchparams2,
+ &searchblock.searchattrs,
+ (uint32_t)searchblock.maxmatches,
+ &timelimit,
+ returnattrs,
+ &nummatches,
+ (uint32_t)uap->scriptcode,
+ (uint32_t)uap->options,
+ auio,
+ (struct searchstate *) &state->ss_fsstate,
+ ctx);
+
+ /*
+ * If it's a union mount we need to be called again
+ * to search the mounted-on filesystem.
+ */
+ if ((vp->v_mount->mnt_flag & MNT_UNION) && fserror == 0) {
+ state->ss_union_flags = SRCHFS_START;
+ state->ss_union_layer++; // search next layer down
+ fserror = EAGAIN;
+ }
+
+saveandexit:
+
+ vnode_put(vp);
+
+ /* Now copy out the stuff that needs copying out. That means the number of matches, the
+ * search state. Everything was already put into he return buffer by the vop call. */
+
+ if ((error = copyout((caddr_t) state, uap->state, sizeof(struct searchstate))) != 0) {
+ goto freeandexit;
+ }
+
+ if ((error = suulong(uap->nummatches, (uint64_t)nummatches)) != 0) {
+ goto freeandexit;
+ }
+
+ error = fserror;
+
+freeandexit:
+
+ kheap_free(KHEAP_DATA_BUFFERS, searchparams1, mallocsize);
+
+ return error;
+} /* end of searchfs system call */
+
+#else /* CONFIG_SEARCHFS */
+
+int
+searchfs(__unused proc_t p, __unused struct searchfs_args *uap, __unused int32_t *retval)
+{
+ return ENOTSUP;
+}
+
+#endif /* CONFIG_SEARCHFS */
+
+
+#if CONFIG_DATALESS_FILES
+
+/*
+ * === Namespace Resolver Up-call Mechanism ===
+ *
+ * When I/O is performed to a dataless file or directory (read, write,
+ * lookup-in, etc.), the file system performs an upcall to the namespace
+ * resolver (filecoordinationd) to materialize the object.
+ *
+ * We need multiple up-calls to be in flight at once, and we need these
+ * up-calls to be interruptible, thus the following implementation:
+ *
+ * => The nspace_resolver_request represents the in-kernel request state.
+ * It contains a request ID, storage space for the errno code returned
+ * by filecoordinationd, and flags.
+ *
+ * => The request ID is simply a global monotonically incrementing 32-bit
+ * number. Outstanding requests are stored in a hash table, and the
+ * hash function is extremely simple.
+ *
+ * => When an upcall is to be made to filecoordinationd, a request structure
+ * is allocated on the stack (it is small, and needs to live only during
+ * the duration of the call to resolve_nspace_item_ext()). It is
+ * initialized and inserted into the table. Some backpressure from
+ * filecoordinationd is applied by limiting the numnber of entries that
+ * can be inserted into the table (and thus limiting the number of
+ * outstanding requests issued to filecoordinationd); waiting for an
+ * available slot is interruptible.
+ *
+ * => Once the request has been inserted into the table, the up-call is made
+ * to filecoordinationd via a MiG-generated stub. The up-call returns
+ * immediately and filecoordinationd processes the request asynchronously.
+ *
+ * => The caller now waits for the request to complete. Tnis is achieved by
+ * sleeping on the address of the request structure and waiting for
+ * filecoordinationd to mark the request structure as complete. This
+ * is an interruptible sleep call; if interrupted, the request structure
+ * is removed from the table and EINTR is returned to the caller. If
+ * this occurs, an advisory up-call is made to filecoordinationd with
+ * the request ID to indicate that the request can be aborted or
+ * de-prioritized at the discretion of filecoordinationd.
+ *
+ * => When filecoordinationd has completed the request, it signals completion
+ * by writing to the vfs.nspace.complete sysctl node. Only a process
+ * decorated as a namespace resolver can write to this sysctl node. The
+ * value is a request ID / errno tuple passed as an array of 2 uint32_t's.
+ * The request ID is looked up in the table, and if the request is found,
+ * the error code is stored in the request structure and a wakeup()
+ * issued on the address of the request structure. If the request is not
+ * found, we simply drop the completion notification, assuming that the
+ * caller was interrupted.
+ *
+ * => When the waiting thread wakes up, it extracts the error code from the
+ * request structure, removes the request from the table, and returns the
+ * error code to the calling function. Fini!
+ */
+
+struct nspace_resolver_request {
+ LIST_ENTRY(nspace_resolver_request) r_hashlink;
+ vnode_t r_vp;
+ uint32_t r_req_id;
+ int r_resolver_error;
+ int r_flags;
+};
+
+#define RRF_COMPLETE 0x0001
+
+static uint32_t
+next_nspace_req_id(void)
+{
+ static uint32_t next_req_id;
+
+ return OSAddAtomic(1, &next_req_id);
+}
+
+#define NSPACE_RESOLVER_REQ_HASHSIZE 32 /* XXX tune */
+#define NSPACE_RESOLVER_MAX_OUTSTANDING 256 /* XXX tune */
+
+static LIST_HEAD(nspace_resolver_requesthead,
+ nspace_resolver_request) * nspace_resolver_request_hashtbl;
+static u_long nspace_resolver_request_hashmask;
+static u_int nspace_resolver_request_count;
+static bool nspace_resolver_request_wait_slot;
+static lck_grp_t *nspace_resolver_request_lck_grp;
+static lck_mtx_t nspace_resolver_request_hash_mutex;
+
+#define NSPACE_REQ_LOCK() \
+ lck_mtx_lock(&nspace_resolver_request_hash_mutex)
+#define NSPACE_REQ_UNLOCK() \
+ lck_mtx_unlock(&nspace_resolver_request_hash_mutex)
+
+#define NSPACE_RESOLVER_HASH(req_id) \
+ (&nspace_resolver_request_hashtbl[(req_id) & \
+ nspace_resolver_request_hashmask])
+
+static struct nspace_resolver_request *
+nspace_resolver_req_lookup(uint32_t req_id)
+{
+ struct nspace_resolver_requesthead *bucket;
+ struct nspace_resolver_request *req;
+
+ bucket = NSPACE_RESOLVER_HASH(req_id);
+ LIST_FOREACH(req, bucket, r_hashlink) {
+ if (req->r_req_id == req_id) {
+ return req;
+ }
+ }
+
+ return NULL;
+}
+
+static int
+nspace_resolver_req_add(struct nspace_resolver_request *req)
+{
+ struct nspace_resolver_requesthead *bucket;
+ int error;
+
+ while (nspace_resolver_request_count >=
+ NSPACE_RESOLVER_MAX_OUTSTANDING) {
+ nspace_resolver_request_wait_slot = true;
+ error = msleep(&nspace_resolver_request_count,
+ &nspace_resolver_request_hash_mutex,
+ PVFS | PCATCH, "nspacerq", NULL);
+ if (error) {
+ return error;
+ }
+ }
+
+ bucket = NSPACE_RESOLVER_HASH(req->r_req_id);
+#if DIAGNOSTIC
+ assert(nspace_resolver_req_lookup(req->r_req_id) == NULL);
+#endif /* DIAGNOSTIC */
+ LIST_INSERT_HEAD(bucket, req, r_hashlink);
+ nspace_resolver_request_count++;
+
+ return 0;
+}
+
+static void
+nspace_resolver_req_remove(struct nspace_resolver_request *req)
+{
+ struct nspace_resolver_requesthead *bucket;
+
+ bucket = NSPACE_RESOLVER_HASH(req->r_req_id);
+#if DIAGNOSTIC
+ assert(nspace_resolver_req_lookup(req->r_req_id) != NULL);
+#endif /* DIAGNOSTIC */
+ LIST_REMOVE(req, r_hashlink);
+ nspace_resolver_request_count--;
+
+ if (nspace_resolver_request_wait_slot) {
+ nspace_resolver_request_wait_slot = false;
+ wakeup(&nspace_resolver_request_count);
+ }
+}
+
+static void
+nspace_resolver_req_cancel(uint32_t req_id)
+{
+ kern_return_t kr;
+ mach_port_t mp;
+
+ // Failures here aren't fatal -- the cancellation message
+ // sent to the resolver is merely advisory.
+
+ kr = host_get_filecoordinationd_port(host_priv_self(), &mp);
+ if (kr != KERN_SUCCESS || !IPC_PORT_VALID(mp)) {
+ return;
+ }
+
+ kr = send_nspace_resolve_cancel(mp, req_id);
+ if (kr != KERN_SUCCESS) {
+ os_log_error(OS_LOG_DEFAULT,
+ "NSPACE send_nspace_resolve_cancel failure: %d", kr);
+ }
+
+ ipc_port_release_send(mp);
+}
+
+static int
+nspace_resolver_req_wait(struct nspace_resolver_request *req)
+{
+ bool send_cancel_message = false;
+ int error;
+
+ NSPACE_REQ_LOCK();
+
+ while ((req->r_flags & RRF_COMPLETE) == 0) {
+ error = msleep(req, &nspace_resolver_request_hash_mutex,
+ PVFS | PCATCH, "nspace", NULL);
+ if (error && error != ERESTART) {
+ req->r_resolver_error = (error == EINTR) ? EINTR :
+ ETIMEDOUT;
+ send_cancel_message = true;
+ break;
+ }
+ }
+
+ nspace_resolver_req_remove(req);
+
+ NSPACE_REQ_UNLOCK();
+
+ if (send_cancel_message) {
+ nspace_resolver_req_cancel(req->r_req_id);
+ }
+
+ return req->r_resolver_error;
+}
+
+static void
+nspace_resolver_req_mark_complete(
+ struct nspace_resolver_request *req,
+ int resolver_error)
+{
+ req->r_resolver_error = resolver_error;
+ req->r_flags |= RRF_COMPLETE;
+ wakeup(req);
+}
+
+static void
+nspace_resolver_req_completed(uint32_t req_id, int resolver_error, uint64_t orig_gencount)
+{
+ struct nspace_resolver_request *req;
+
+ NSPACE_REQ_LOCK();
+
+ // If we don't find the request corresponding to our req_id,
+ // just drop the completion signal on the floor; it's likely
+ // that the requester interrupted with a signal.
+
+ req = nspace_resolver_req_lookup(req_id);
+ if (req) {
+ mount_t locked_mp = NULL;
+
+ locked_mp = req->r_vp->v_mount;
+ mount_ref(locked_mp, 0);
+ mount_lock_renames(locked_mp);
+
+ //
+ // if the resolver isn't already returning an error and we have an
+ // orig_gencount, then get an iocount on the request vnode and check
+ // that the gencount on req->r_vp has not changed.
+ //
+ // note: a ref was taken on req->r_vp when the request was created
+ // and that ref will be dropped by that thread when it wakes up.
+ //
+ if (resolver_error == 0 &&
+ orig_gencount != 0 &&
+ vnode_getwithref(req->r_vp) == 0) {
+ struct vnode_attr va;
+ uint64_t cur_gencount;
+
+ VATTR_INIT(&va);
+ VATTR_WANTED(&va, va_recursive_gencount);
+
+ if (vnode_getattr(req->r_vp, &va, vfs_context_kernel()) == 0) {
+ cur_gencount = va.va_recursive_gencount;
+ } else {
+ cur_gencount = 0;
+ }
+
+ if (resolver_error == 0 && cur_gencount && orig_gencount && cur_gencount != orig_gencount) {
+ printf("nspace.complete: gencount changed! (orig %llu cur %llu)\n", orig_gencount, cur_gencount);
+
+ // this error will be returned to the thread that initiated the
+ // materialization of req->r_vp.
+ resolver_error = EBUSY;
+
+ // note: we explicitly do not return an error to the caller (i.e.
+ // the thread that did the materialization) because they said they
+ // don't want one.
+ }
+
+ vnode_put(req->r_vp);
+ }
+
+ mount_unlock_renames(locked_mp);
+ mount_drop(locked_mp, 0);
+
+ nspace_resolver_req_mark_complete(req, resolver_error);
+ }
+
+ NSPACE_REQ_UNLOCK();
+
+ return;
+}
+
+static struct proc *nspace_resolver_proc;
+
+static int
+nspace_resolver_get_proc_state(struct proc *p, int *is_resolver)
+{
+ *is_resolver = ((p->p_lflag & P_LNSPACE_RESOLVER) &&
+ p == nspace_resolver_proc) ? 1 : 0;
+ return 0;
+}
+
+static int
+nspace_resolver_set_proc_state(struct proc *p, int is_resolver)
+{
+ vfs_context_t ctx = vfs_context_current();
+ int error = 0;
+
+ //
+ // The system filecoordinationd runs as uid == 0. This also
+ // has the nice side-effect of filtering out filecoordinationd
+ // running in the simulator.
+ //
+ if (!vfs_context_issuser(ctx)) {
+ return EPERM;
+ }
+
+ error = priv_check_cred(vfs_context_ucred(ctx),
+ PRIV_VFS_DATALESS_RESOLVER, 0);
+ if (error) {
+ return error;
+ }
+
+ if (is_resolver) {
+ NSPACE_REQ_LOCK();
+
+ if (nspace_resolver_proc == NULL) {
+ proc_lock(p);
+ p->p_lflag |= P_LNSPACE_RESOLVER;
+ proc_unlock(p);
+ nspace_resolver_proc = p;
+ } else {
+ error = EBUSY;
+ }
+
+ NSPACE_REQ_UNLOCK();
+ } else {
+ // This is basically just like the exit case.
+ // nspace_resolver_exited() will verify that the
+ // process is the resolver, and will clear the
+ // global.
+ nspace_resolver_exited(p);
+ }
+
+ return error;
+}
+
+static int
+nspace_materialization_get_proc_state(struct proc *p, int *is_prevented)
+{
+ if ((p->p_lflag & P_LNSPACE_RESOLVER) != 0 ||
+ (p->p_vfs_iopolicy &
+ P_VFS_IOPOLICY_MATERIALIZE_DATALESS_FILES) == 0) {
+ *is_prevented = 1;
+ } else {
+ *is_prevented = 0;
+ }
+ return 0;
+}
+
+static int
+nspace_materialization_set_proc_state(struct proc *p, int is_prevented)
+{
+ if (p->p_lflag & P_LNSPACE_RESOLVER) {
+ return is_prevented ? 0 : EBUSY;
+ }
+
+ if (is_prevented) {
+ OSBitAndAtomic16(~((uint16_t)P_VFS_IOPOLICY_MATERIALIZE_DATALESS_FILES), &p->p_vfs_iopolicy);
+ } else {
+ OSBitOrAtomic16((uint16_t)P_VFS_IOPOLICY_MATERIALIZE_DATALESS_FILES, &p->p_vfs_iopolicy);
+ }
+ return 0;
+}
+
+static int
+nspace_materialization_get_thread_state(int *is_prevented)
+{
+ uthread_t ut = get_bsdthread_info(current_thread());
+
+ *is_prevented = (ut->uu_flag & UT_NSPACE_NODATALESSFAULTS) ? 1 : 0;
+ return 0;
+}
+
+static int
+nspace_materialization_set_thread_state(int is_prevented)
+{
+ uthread_t ut = get_bsdthread_info(current_thread());
+
+ if (is_prevented) {
+ ut->uu_flag |= UT_NSPACE_NODATALESSFAULTS;
+ } else {
+ ut->uu_flag &= ~UT_NSPACE_NODATALESSFAULTS;
+ }
+ return 0;
+}
+
+static int
+nspace_materialization_is_prevented(void)
+{
+ proc_t p = current_proc();
+ uthread_t ut = (uthread_t)get_bsdthread_info(current_thread());
+ vfs_context_t ctx = vfs_context_current();
+
+ /*
+ * Kernel context ==> return EDEADLK, as we would with any random
+ * process decorated as no-materialize.
+ */
+ if (ctx == vfs_context_kernel()) {
+ return EDEADLK;
+ }
+
+ /*
+ * If the process has the dataless-manipulation entitlement,
+ * materialization is prevented, and depending on the kind
+ * of file system operation, things get to proceed as if the
+ * object is not dataless.
+ */
+ if (vfs_context_is_dataless_manipulator(ctx)) {
+ return EJUSTRETURN;
+ }
+
+ /*
+ * Per-thread decorations override any process-wide decorations.
+ * (Foundation uses this, and this overrides even the dataless-
+ * manipulation entitlement so as to make API contracts consistent.)
+ */
+ if (ut != NULL) {
+ if (ut->uu_flag & UT_NSPACE_NODATALESSFAULTS) {
+ return EDEADLK;
+ }
+ if (ut->uu_flag & UT_NSPACE_FORCEDATALESSFAULTS) {
+ return 0;
+ }
+ }
+
+ /*
+ * If the process's iopolicy specifies that dataless files
+ * can be materialized, then we let it go ahead.
+ */
+ if (p->p_vfs_iopolicy & P_VFS_IOPOLICY_MATERIALIZE_DATALESS_FILES) {
+ return 0;
+ }
+
+ /*
+ * The default behavior is to not materialize dataless files;
+ * return to the caller that deadlock was detected.
+ */
+ return EDEADLK;
+}
+
+/* the vfs.nspace branch */
+SYSCTL_NODE(_vfs, OID_AUTO, nspace, CTLFLAG_RW | CTLFLAG_LOCKED, NULL, "vfs nspace hinge");
+
+static int
+sysctl_nspace_resolver(__unused struct sysctl_oid *oidp,
+ __unused void *arg1, __unused int arg2, struct sysctl_req *req)
+{
+ struct proc *p = req->p;
+ int new_value, old_value, changed = 0;
+ int error;
+
+ error = nspace_resolver_get_proc_state(p, &old_value);
+ if (error) {
+ return error;
+ }
+
+ error = sysctl_io_number(req, old_value, sizeof(int), &new_value,
+ &changed);
+ if (error == 0 && changed) {
+ error = nspace_resolver_set_proc_state(p, new_value);
+ }
+ return error;
+}
+
+/* decorate this process as the dataless file resolver */
+SYSCTL_PROC(_vfs_nspace, OID_AUTO, resolver,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY | CTLFLAG_LOCKED,
+ 0, 0, sysctl_nspace_resolver, "I", "");
+
+static int
+sysctl_nspace_prevent_materialization(__unused struct sysctl_oid *oidp,
+ __unused void *arg1, __unused int arg2, struct sysctl_req *req)
+{
+ struct proc *p = req->p;
+ int new_value, old_value, changed = 0;
+ int error;
+
+ error = nspace_materialization_get_proc_state(p, &old_value);
+ if (error) {
+ return error;
+ }
+
+ error = sysctl_io_number(req, old_value, sizeof(int), &new_value,
+ &changed);
+ if (error == 0 && changed) {
+ error = nspace_materialization_set_proc_state(p, new_value);
+ }
+ return error;
+}
+
+/* decorate this process as not wanting to materialize dataless files */
+SYSCTL_PROC(_vfs_nspace, OID_AUTO, prevent_materialization,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY | CTLFLAG_LOCKED,
+ 0, 0, sysctl_nspace_prevent_materialization, "I", "");
+
+static int
+sysctl_nspace_thread_prevent_materialization(__unused struct sysctl_oid *oidp,
+ __unused void *arg1, __unused int arg2, struct sysctl_req *req)
+{
+ int new_value, old_value, changed = 0;
+ int error;
+
+ error = nspace_materialization_get_thread_state(&old_value);
+ if (error) {
+ return error;
+ }
+
+ error = sysctl_io_number(req, old_value, sizeof(int), &new_value,
+ &changed);
+ if (error == 0 && changed) {
+ error = nspace_materialization_set_thread_state(new_value);
+ }
+ return error;
+}
+
+/* decorate this thread as not wanting to materialize dataless files */
+SYSCTL_PROC(_vfs_nspace, OID_AUTO, thread_prevent_materialization,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY | CTLFLAG_LOCKED,
+ 0, 0, sysctl_nspace_thread_prevent_materialization, "I", "");
+
+static int
+sysctl_nspace_complete(__unused struct sysctl_oid *oidp, __unused void *arg1,
+ __unused int arg2, struct sysctl_req *req)
+{
+ struct proc *p = req->p;
+ uint32_t req_status[2] = { 0, 0 };
+ uint64_t gencount = 0;
+ int error, is_resolver, changed = 0, gencount_changed;
+
+ error = nspace_resolver_get_proc_state(p, &is_resolver);
+ if (error) {
+ return error;
+ }
+
+ if (!is_resolver) {
+ return EPERM;
+ }
+
+ error = sysctl_io_opaque(req, req_status, sizeof(req_status),
+ &changed);
+ if (error) {
+ return error;
+ }
+
+ // get the gencount if it was passed
+ error = sysctl_io_opaque(req, &gencount, sizeof(gencount),
+ &gencount_changed);
+ if (error) {
+ gencount = 0;
+ // we ignore the error because the gencount was optional
+ error = 0;
+ }
+
+ /*
+ * req_status[0] is the req_id
+ *
+ * req_status[1] is the errno
+ */
+ if (error == 0 && changed) {
+ nspace_resolver_req_completed(req_status[0],
+ (int)req_status[1], gencount);
+ }
+ return error;
+}
+
+/* Resolver reports completed reqs here. */
+SYSCTL_PROC(_vfs_nspace, OID_AUTO, complete,
+ CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_ANYBODY | CTLFLAG_LOCKED,
+ 0, 0, sysctl_nspace_complete, "-", "");
+
+#endif /* CONFIG_DATALESS_FILES */
+
+#if CONFIG_DATALESS_FILES
+#define __no_dataless_unused /* nothing */
+#else
+#define __no_dataless_unused __unused
+#endif
+
+void
+nspace_resolver_init(void)
+{
+#if CONFIG_DATALESS_FILES
+ nspace_resolver_request_lck_grp =
+ lck_grp_alloc_init("file namespace resolver", NULL);
+
+ lck_mtx_init(&nspace_resolver_request_hash_mutex,
+ nspace_resolver_request_lck_grp, NULL);
+
+ nspace_resolver_request_hashtbl =
+ hashinit(NSPACE_RESOLVER_REQ_HASHSIZE,
+ M_VNODE /* XXX */, &nspace_resolver_request_hashmask);
+#endif /* CONFIG_DATALESS_FILES */
+}
+
+void
+nspace_resolver_exited(struct proc *p __no_dataless_unused)
+{
+#if CONFIG_DATALESS_FILES
+ struct nspace_resolver_requesthead *bucket;
+ struct nspace_resolver_request *req;
+ u_long idx;
+
+ NSPACE_REQ_LOCK();
+
+ if ((p->p_lflag & P_LNSPACE_RESOLVER) &&
+ p == nspace_resolver_proc) {
+ for (idx = 0; idx <= nspace_resolver_request_hashmask; idx++) {
+ bucket = &nspace_resolver_request_hashtbl[idx];
+ LIST_FOREACH(req, bucket, r_hashlink) {
+ nspace_resolver_req_mark_complete(req,
+ ETIMEDOUT);
+ }
+ }
+ nspace_resolver_proc = NULL;
+ }
+
+ NSPACE_REQ_UNLOCK();
+#endif /* CONFIG_DATALESS_FILES */
+}
+
+int
+resolve_nspace_item(struct vnode *vp, uint64_t op)
+{
+ return resolve_nspace_item_ext(vp, op, NULL);
+}
+
+#define DATALESS_RESOLVER_ENTITLEMENT \
+ "com.apple.private.vfs.dataless-resolver"
+#define DATALESS_MANIPULATION_ENTITLEMENT \
+ "com.apple.private.vfs.dataless-manipulation"
+
+/*
+ * Return TRUE if the vfs context is associated with a process entitled
+ * for dataless manipulation.
+ *
+ * XXX Arguably belongs in vfs_subr.c, but is here because of the
+ * complication around CONFIG_DATALESS_FILES.
+ */
+boolean_t
+vfs_context_is_dataless_manipulator(vfs_context_t ctx __unused)
+{
+#if CONFIG_DATALESS_FILES
+ assert(ctx->vc_thread == current_thread());
+ task_t const task = current_task();
+ return IOTaskHasEntitlement(task, DATALESS_MANIPULATION_ENTITLEMENT) ||
+ IOTaskHasEntitlement(task, DATALESS_RESOLVER_ENTITLEMENT);
+#else
+ return false;
+#endif /* CONFIG_DATALESS_FILES */
+}
+
+int
+resolve_nspace_item_ext(
+ struct vnode *vp __no_dataless_unused,
+ uint64_t op __no_dataless_unused,
+ void *arg __unused)
+{
+#if CONFIG_DATALESS_FILES
+ int error;
+ mach_port_t mp;
+ char *path = NULL;
+ int path_len;
+ kern_return_t kr;
+ struct nspace_resolver_request req;
+
+ // only allow namespace events on regular files, directories and symlinks.
+ if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) {
+ return EFTYPE;
+ }
+
+ //
+ // if this is a snapshot event and the vnode is on a
+ // disk image just pretend nothing happened since any
+ // change to the disk image will cause the disk image
+ // itself to get backed up and this avoids multi-way
+ // deadlocks between the snapshot handler and the ever
+ // popular diskimages-helper process. the variable
+ // nspace_allow_virtual_devs allows this behavior to
+ // be overridden (for use by the Mobile TimeMachine
+ // testing infrastructure which uses disk images)
+ //
+ if (op & NAMESPACE_HANDLER_SNAPSHOT_EVENT) {
+ os_log_debug(OS_LOG_DEFAULT, "NSPACE SNAPSHOT not handled");
+ return ENOTSUP;
+ }
+
+ error = nspace_materialization_is_prevented();
+ if (error) {
+ os_log_debug(OS_LOG_DEFAULT,
+ "NSPACE process/thread is decorated as no-materialization");
+ return error;
+ }
+
+ kr = host_get_filecoordinationd_port(host_priv_self(), &mp);
+ if (kr != KERN_SUCCESS || !IPC_PORT_VALID(mp)) {
+ os_log_error(OS_LOG_DEFAULT, "NSPACE no port");
+ // Treat this like being unable to access the backing
+ // store server.
+ return ETIMEDOUT;
+ }
+
+ path = zalloc(ZV_NAMEI);
+ path_len = MAXPATHLEN;
+
+ error = vn_getpath(vp, path, &path_len);
+ if (error == 0) {
+ int xxx_rdar44371223; /* XXX Mig bug */
+ req.r_req_id = next_nspace_req_id();
+ req.r_resolver_error = 0;
+ req.r_flags = 0;
+
+ if ((error = vnode_ref(vp)) == 0) { // take a ref so that the vnode doesn't go away
+ req.r_vp = vp;
+ } else {
+ goto out_release_port;
+ }
+
+ NSPACE_REQ_LOCK();
+ error = nspace_resolver_req_add(&req);
+ NSPACE_REQ_UNLOCK();
+ if (error) {
+ vnode_rele(req.r_vp);
+ goto out_release_port;
+ }
+
+ os_log_debug(OS_LOG_DEFAULT, "NSPACE resolve_path call");
+ kr = send_nspace_resolve_path(mp, req.r_req_id,
+ current_proc()->p_pid, (uint32_t)(op & 0xffffffff),
+ path, &xxx_rdar44371223);
+ if (kr != KERN_SUCCESS) {
+ // Also treat this like being unable to access
+ // the backing store server.
+ os_log_error(OS_LOG_DEFAULT,
+ "NSPACE resolve_path failure: %d", kr);
+ error = ETIMEDOUT;
+
+ NSPACE_REQ_LOCK();
+ nspace_resolver_req_remove(&req);
+ NSPACE_REQ_UNLOCK();
+ vnode_rele(req.r_vp);
+ goto out_release_port;
+ }
+
+ // Give back the memory we allocated earlier while
+ // we wait; we no longer need it.
+ zfree(ZV_NAMEI, path);
+ path = NULL;
+
+ // Request has been submitted to the resolver.
+ // Now (interruptibly) wait for completion.
+ // Upon requrn, the request will have been removed
+ // from the lookup table.
+ error = nspace_resolver_req_wait(&req);
+
+ vnode_rele(req.r_vp);
+ }
+
+out_release_port:
+ if (path != NULL) {
+ zfree(ZV_NAMEI, path);
+ }
+ ipc_port_release_send(mp);
+
+ return error;
+#else
+ return ENOTSUP;
+#endif /* CONFIG_DATALESS_FILES */
+}
+
+int
+nspace_snapshot_event(__unused vnode_t vp, __unused time_t ctime,
+ __unused uint64_t op_type, __unused void *arg)
+{
+ return 0;
+}
+
+#if 0
+static int
+build_volfs_path(struct vnode *vp, char *path, int *len)
+{
+ struct vnode_attr va;
+ int ret;
+
+ VATTR_INIT(&va);
+ VATTR_WANTED(&va, va_fsid);
+ VATTR_WANTED(&va, va_fileid);
+
+ if (vnode_getattr(vp, &va, vfs_context_kernel()) != 0) {
+ *len = snprintf(path, *len, "/non/existent/path/because/vnode_getattr/failed") + 1;
+ ret = -1;
+ } else {
+ *len = snprintf(path, *len, "/.vol/%d/%lld", (dev_t)va.va_fsid, va.va_fileid) + 1;
+ ret = 0;
+ }
+
+ return ret;
+}
+#endif
+
+static unsigned long
+fsctl_bogus_command_compat(unsigned long cmd)
+{
+ switch (cmd) {
+ case IOCBASECMD(FSIOC_SYNC_VOLUME):
+ return FSIOC_SYNC_VOLUME;
+ case IOCBASECMD(FSIOC_ROUTEFS_SETROUTEID):
+ return FSIOC_ROUTEFS_SETROUTEID;
+ case IOCBASECMD(FSIOC_SET_PACKAGE_EXTS):
+ return FSIOC_SET_PACKAGE_EXTS;
+ case IOCBASECMD(FSIOC_SET_FSTYPENAME_OVERRIDE):
+ return FSIOC_SET_FSTYPENAME_OVERRIDE;
+ case IOCBASECMD(DISK_CONDITIONER_IOC_GET):
+ return DISK_CONDITIONER_IOC_GET;
+ case IOCBASECMD(DISK_CONDITIONER_IOC_SET):
+ return DISK_CONDITIONER_IOC_SET;
+ case IOCBASECMD(FSIOC_FIOSEEKHOLE):
+ return FSIOC_FIOSEEKHOLE;
+ case IOCBASECMD(FSIOC_FIOSEEKDATA):
+ return FSIOC_FIOSEEKDATA;
+ case IOCBASECMD(SPOTLIGHT_IOC_GET_MOUNT_TIME):
+ return SPOTLIGHT_IOC_GET_MOUNT_TIME;
+ case IOCBASECMD(SPOTLIGHT_IOC_GET_LAST_MTIME):
+ return SPOTLIGHT_IOC_GET_LAST_MTIME;
+ }
+
+ return cmd;
+}
+
+static int
+cas_bsdflags_setattr(vnode_t vp, void *arg, vfs_context_t ctx)
+{
+ return VNOP_IOCTL(vp, FSIOC_CAS_BSDFLAGS, arg, FWRITE, ctx);
+}
+
+static int __attribute__((noinline))
+handle_sync_volume(vnode_t vp, vnode_t *arg_vp, caddr_t data, vfs_context_t ctx)
+{
+ struct vfs_attr vfa;
+ mount_t mp = vp->v_mount;
+ unsigned arg;
+ int error;
+
+ /* record vid of vp so we can drop it below. */
+ uint32_t vvid = vp->v_id;
+
+ /*
+ * Then grab mount_iterref so that we can release the vnode.
+ * Without this, a thread may call vnode_iterate_prepare then
+ * get into a deadlock because we've never released the root vp
+ */
+ error = mount_iterref(mp, 0);
+ if (error) {
+ return error;
+ }
+ vnode_put(vp);
+
+ arg = MNT_NOWAIT;
+ if (*(uint32_t*)data & FSCTL_SYNC_WAIT) {
+ arg = MNT_WAIT;
+ }
+
+ /*
+ * If the filessytem supports multiple filesytems in a
+ * partition (For eg APFS volumes in a container, it knows
+ * that the waitfor argument to VFS_SYNC are flags.
+ */
+ VFSATTR_INIT(&vfa);
+ VFSATTR_WANTED(&vfa, f_capabilities);
+ if ((vfs_getattr(mp, &vfa, vfs_context_current()) == 0) &&
+ VFSATTR_IS_SUPPORTED(&vfa, f_capabilities) &&
+ ((vfa.f_capabilities.valid[VOL_CAPABILITIES_FORMAT] & VOL_CAP_FMT_SHARED_SPACE)) &&
+ ((vfa.f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] & VOL_CAP_FMT_SHARED_SPACE))) {
+ arg |= MNT_VOLUME;
+ }
+
+ /* issue the sync for this volume */
+ (void)sync_callback(mp, &arg);
+
+ /*
+ * Then release the mount_iterref once we're done syncing; it's not
+ * needed for the VNOP_IOCTL below
+ */
+ mount_iterdrop(mp);
+
+ if (arg & FSCTL_SYNC_FULLSYNC) {
+ /* re-obtain vnode iocount on the root vp, if possible */
+ error = vnode_getwithvid(vp, vvid);
+ if (error == 0) {
+ error = VNOP_IOCTL(vp, F_FULLFSYNC, (caddr_t)NULL, 0, ctx);
+ vnode_put(vp);
+ }
+ }
+ /* mark the argument VP as having been released */
+ *arg_vp = NULL;
+ return error;
+}
+
+#if ROUTEFS
+static int __attribute__((noinline))
+handle_routes(user_addr_t udata)
+{
+ char routepath[MAXPATHLEN];
+ size_t len = 0;
+ int error;
+
+ if ((error = suser(kauth_cred_get(), &(current_proc()->p_acflag)))) {
+ return error;
+ }
+ bzero(routepath, MAXPATHLEN);
+ error = copyinstr(udata, &routepath[0], MAXPATHLEN, &len);
+ if (error) {
+ return error;
+ }
+ error = routefs_kernel_mount(routepath);
+ return error;
+}
+#endif
+
+static int __attribute__((noinline))
+handle_flags(vnode_t vp, caddr_t data, vfs_context_t ctx)
+{
+ struct fsioc_cas_bsdflags *cas = (struct fsioc_cas_bsdflags *)data;
+ struct vnode_attr va;
+ int error;
+
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_flags, cas->new_flags);
+
+ error = chflags0(vp, &va, cas_bsdflags_setattr, cas, ctx);
+ return error;
+}
+
+static int __attribute__((noinline))
+handle_auth(vnode_t vp, u_long cmd, caddr_t data, u_long options, vfs_context_t ctx)
+{
+ struct mount *mp = NULL;
+ errno_t rootauth = 0;
+
+ mp = vp->v_mount;
+
+ /*
+ * query the underlying FS and see if it reports something
+ * sane for this vnode. If volume is authenticated via
+ * chunklist, leave that for the caller to determine.
+ */
+ rootauth = VNOP_IOCTL(vp, cmd, data, (int)options, ctx);
+
+ return rootauth;
+}
+
+/*
+ * Make a filesystem-specific control call:
+ */
+/* ARGSUSED */
+static int
+fsctl_internal(proc_t p, vnode_t *arg_vp, u_long cmd, user_addr_t udata, u_long options, vfs_context_t ctx)
+{
+ int error = 0;
+ boolean_t is64bit;
+ u_int size;
+#define STK_PARAMS 128
+ char stkbuf[STK_PARAMS] = {0};
+ caddr_t data, memp;
+ vnode_t vp = *arg_vp;
+
+ if (vp->v_type == VCHR || vp->v_type == VBLK) {
+ return ENOTTY;
+ }
+
+ cmd = fsctl_bogus_command_compat(cmd);
+
+ size = IOCPARM_LEN(cmd);
+ if (size > IOCPARM_MAX) {
+ return EINVAL;
+ }
+
+ is64bit = proc_is64bit(p);
+
+ memp = NULL;
+
+ if (size > sizeof(stkbuf)) {
+ if ((memp = (caddr_t)kheap_alloc(KHEAP_TEMP, size, Z_WAITOK)) == 0) {
+ return ENOMEM;
+ }
+ data = memp;
+ } else {
+ data = &stkbuf[0];
+ };
+ if (cmd & IOC_IN) {
+ if (size) {
+ error = copyin(udata, data, size);
+ if (error) {
+ if (memp) {
+ kheap_free(KHEAP_TEMP, memp, size);
+ }
+ return error;
+ }
+ } else {
+ if (is64bit) {
+ *(user_addr_t *)data = udata;
+ } else {
+ *(uint32_t *)data = (uint32_t)udata;
+ }
+ };
+ } else if ((cmd & IOC_OUT) && size) {
/*
- * Convert all the entries and copy them out to user's buffer.
+ * Zero the buffer so the user always
+ * gets back something deterministic.
*/
- while (error == 0 && (char *)dep < ((char *)bufptr + bytesread)) {
- /* Convert a dirent to a dirent64. */
- entry64.d_ino = dep->d_ino;
- entry64.d_seekoff = 0;
- entry64.d_reclen = DIRENT64_LEN(dep->d_namlen);
- entry64.d_namlen = dep->d_namlen;
- entry64.d_type = dep->d_type;
- bcopy(dep->d_name, entry64.d_name, dep->d_namlen + 1);
+ bzero(data, size);
+ } else if (cmd & IOC_VOID) {
+ if (is64bit) {
+ *(user_addr_t *)data = udata;
+ } else {
+ *(uint32_t *)data = (uint32_t)udata;
+ }
+ }
- /* Move to next entry. */
- dep = (struct dirent *)((char *)dep + dep->d_reclen);
+ /* Check to see if it's a generic command */
+ switch (cmd) {
+ case FSIOC_SYNC_VOLUME:
+ error = handle_sync_volume(vp, arg_vp, data, ctx);
+ break;
- /* Copy entry64 to user's buffer. */
- error = uiomove((caddr_t)&entry64, entry64.d_reclen, uio);
+ case FSIOC_ROUTEFS_SETROUTEID:
+#if ROUTEFS
+ error = handle_routes(udata);
+#endif
+ break;
+
+ case FSIOC_SET_PACKAGE_EXTS: {
+ user_addr_t ext_strings;
+ uint32_t num_entries;
+ uint32_t max_width;
+
+ if ((error = priv_check_cred(kauth_cred_get(), PRIV_PACKAGE_EXTENSIONS, 0))) {
+ break;
}
- /* Update the real offset using the offset we got from VNOP_READDIR. */
- if (error == 0) {
- uio->uio_offset = auio->uio_offset;
+ if ((is64bit && size != sizeof(user64_package_ext_info))
+ || (is64bit == 0 && size != sizeof(user32_package_ext_info))) {
+ // either you're 64-bit and passed a 64-bit struct or
+ // you're 32-bit and passed a 32-bit struct. otherwise
+ // it's not ok.
+ error = EINVAL;
+ break;
}
- uio_free(auio);
- FREE(bufptr, M_TEMP);
- return (error);
+
+ if (is64bit) {
+ if (sizeof(user64_addr_t) > sizeof(user_addr_t)) {
+ assert(((user64_package_ext_info *)data)->strings <= UINT32_MAX);
+ }
+ ext_strings = (user_addr_t)((user64_package_ext_info *)data)->strings;
+ num_entries = ((user64_package_ext_info *)data)->num_entries;
+ max_width = ((user64_package_ext_info *)data)->max_width;
+ } else {
+ ext_strings = CAST_USER_ADDR_T(((user32_package_ext_info *)data)->strings);
+ num_entries = ((user32_package_ext_info *)data)->num_entries;
+ max_width = ((user32_package_ext_info *)data)->max_width;
+ }
+ error = set_package_extensions_table(ext_strings, num_entries, max_width);
+ }
+ break;
+
+ case FSIOC_SET_FSTYPENAME_OVERRIDE:
+ {
+ if ((error = suser(kauth_cred_get(), &(current_proc()->p_acflag)))) {
+ break;
+ }
+ if (vp->v_mount) {
+ mount_lock(vp->v_mount);
+ if (data[0] != 0) {
+ int i;
+ for (i = 0; i < MFSTYPENAMELEN; i++) {
+ if (!data[i]) {
+ goto continue_copy;
+ }
+ }
+ /*
+ * Getting here means we have a user data string which has no
+ * NULL termination in its first MFSTYPENAMELEN bytes.
+ * This is bogus, let's avoid strlcpy-ing the read data and
+ * return an error.
+ */
+ error = EINVAL;
+ goto unlock;
+continue_copy:
+ strlcpy(&vp->v_mount->fstypename_override[0], data, MFSTYPENAMELEN);
+ vp->v_mount->mnt_kern_flag |= MNTK_TYPENAME_OVERRIDE;
+ if (vfs_isrdonly(vp->v_mount) && strcmp(vp->v_mount->fstypename_override, "mtmfs") == 0) {
+ vp->v_mount->mnt_kern_flag |= MNTK_EXTENDED_SECURITY;
+ vp->v_mount->mnt_kern_flag &= ~MNTK_AUTH_OPAQUE;
+ }
+ } else {
+ if (strcmp(vp->v_mount->fstypename_override, "mtmfs") == 0) {
+ vp->v_mount->mnt_kern_flag &= ~MNTK_EXTENDED_SECURITY;
+ }
+ vp->v_mount->mnt_kern_flag &= ~MNTK_TYPENAME_OVERRIDE;
+ vp->v_mount->fstypename_override[0] = '\0';
+ }
+unlock:
+ mount_unlock(vp->v_mount);
+ }
+ }
+ break;
+
+ case DISK_CONDITIONER_IOC_GET: {
+ error = disk_conditioner_get_info(vp->v_mount, (disk_conditioner_info *)data);
+ }
+ break;
+
+ case DISK_CONDITIONER_IOC_SET: {
+ error = disk_conditioner_set_info(vp->v_mount, (disk_conditioner_info *)data);
+ }
+ break;
+
+ case FSIOC_CAS_BSDFLAGS:
+ error = handle_flags(vp, data, ctx);
+ break;
+
+ case FSIOC_FD_ONLY_OPEN_ONCE: {
+ error = 0;
+ if (vnode_usecount(vp) > 1) {
+ vnode_lock_spin(vp);
+ if (vp->v_lflag & VL_HASSTREAMS) {
+ if (vnode_isinuse_locked(vp, 1, 1)) {
+ error = EBUSY;
+ }
+ } else if (vnode_usecount(vp) > 1) {
+ error = EBUSY;
+ }
+ vnode_unlock(vp);
+ }
+ }
+ break;
+
+ case FSIOC_EVAL_ROOTAUTH:
+ error = handle_auth(vp, cmd, data, options, ctx);
+ break;
+
+ default: {
+ /* other, known commands shouldn't be passed down here */
+ switch (cmd) {
+ case F_PUNCHHOLE:
+ case F_TRIM_ACTIVE_FILE:
+ case F_RDADVISE:
+ case F_TRANSCODEKEY:
+ case F_GETPROTECTIONLEVEL:
+ case F_GETDEFAULTPROTLEVEL:
+ case F_MAKECOMPRESSED:
+ case F_SET_GREEDY_MODE:
+ case F_SETSTATICCONTENT:
+ case F_SETIOTYPE:
+ case F_SETBACKINGSTORE:
+ case F_GETPATH_MTMINFO:
+ case APFSIOC_REVERT_TO_SNAPSHOT:
+ case FSIOC_FIOSEEKHOLE:
+ case FSIOC_FIOSEEKDATA:
+ case HFS_GET_BOOT_INFO:
+ case HFS_SET_BOOT_INFO:
+ case FIOPINSWAP:
+ case F_CHKCLEAN:
+ case F_FULLFSYNC:
+ case F_BARRIERFSYNC:
+ case F_FREEZE_FS:
+ case F_THAW_FS:
+ case FSIOC_KERNEL_ROOTAUTH:
+ error = EINVAL;
+ goto outdrop;
+ }
+ /* Invoke the filesystem-specific code */
+ error = VNOP_IOCTL(vp, cmd, data, (int)options, ctx);
+ }
+ } /* end switch stmt */
+
+ /*
+ * if no errors, copy any data to user. Size was
+ * already set and checked above.
+ */
+ if (error == 0 && (cmd & IOC_OUT) && size) {
+ error = copyout(data, udata, size);
+ }
+
+outdrop:
+ if (memp) {
+ kheap_free(KHEAP_TEMP, memp, size);
}
+
+ return error;
}
-/*
- * Read a block of directory entries in a file system independent format.
- */
-static int
-getdirentries_common(int fd, user_addr_t bufp, user_size_t bufsize, ssize_t *bytesread,
- off_t *offset, int flags)
+/* ARGSUSED */
+int
+fsctl(proc_t p, struct fsctl_args *uap, __unused int32_t *retval)
{
- vnode_t vp;
- struct vfs_context context = *vfs_context_current(); /* local copy */
- struct fileproc *fp;
- uio_t auio;
- int spacetype = proc_is64bit(vfs_context_proc(&context)) ? UIO_USERSPACE64 : UIO_USERSPACE32;
- off_t loff;
- int error, eofflag, numdirent;
- char uio_buf[ UIO_SIZEOF(1) ];
+ int error;
+ struct nameidata nd;
+ uint32_t nameiflags;
+ vnode_t vp = NULL;
+ vfs_context_t ctx = vfs_context_current();
- error = fp_getfvp(vfs_context_proc(&context), fd, &fp, &vp);
+ AUDIT_ARG(cmd, (int)uap->cmd);
+ AUDIT_ARG(value32, uap->options);
+ /* Get the vnode for the file we are getting info on: */
+ nameiflags = 0;
+ //
+ // if we come through fsctl() then the file is by definition not open.
+ // therefore for the FSIOC_FD_ONLY_OPEN_ONCE selector we return an error
+ // lest the caller mistakenly thinks the only open is their own (but in
+ // reality it's someone elses).
+ //
+ if (uap->cmd == FSIOC_FD_ONLY_OPEN_ONCE) {
+ return EINVAL;
+ }
+ if ((uap->options & FSOPT_NOFOLLOW) == 0) {
+ nameiflags |= FOLLOW;
+ }
+ if (uap->cmd == FSIOC_FIRMLINK_CTL) {
+ nameiflags |= (CN_FIRMLINK_NOFOLLOW | NOCACHE);
+ }
+ NDINIT(&nd, LOOKUP, OP_FSCTL, nameiflags | AUDITVNPATH1,
+ UIO_USERSPACE, uap->path, ctx);
+ if ((error = namei(&nd))) {
+ goto done;
+ }
+ vp = nd.ni_vp;
+ nameidone(&nd);
+
+#if CONFIG_MACF
+ error = mac_mount_check_fsctl(ctx, vnode_mount(vp), uap->cmd);
if (error) {
- return (error);
+ goto done;
}
- if ((fp->f_fglob->fg_flag & FREAD) == 0) {
- AUDIT_ARG(vnpath_withref, vp, ARG_VNODE1);
- error = EBADF;
- goto out;
+#endif
+
+ error = fsctl_internal(p, &vp, uap->cmd, (user_addr_t)uap->data, uap->options, ctx);
+
+done:
+ if (vp) {
+ vnode_put(vp);
+ }
+ return error;
+}
+/* ARGSUSED */
+int
+ffsctl(proc_t p, struct ffsctl_args *uap, __unused int32_t *retval)
+{
+ int error;
+ vnode_t vp = NULL;
+ vfs_context_t ctx = vfs_context_current();
+ int fd = -1;
+
+ AUDIT_ARG(fd, uap->fd);
+ AUDIT_ARG(cmd, (int)uap->cmd);
+ AUDIT_ARG(value32, uap->options);
+
+ /* Get the vnode for the file we are getting info on: */
+ if ((error = file_vnode(uap->fd, &vp))) {
+ return error;
+ }
+ fd = uap->fd;
+ if ((error = vnode_getwithref(vp))) {
+ file_drop(fd);
+ return error;
}
#if CONFIG_MACF
- error = mac_file_check_change_offset(vfs_context_ucred(&context), fp->f_fglob);
- if (error)
- goto out;
+ if ((error = mac_mount_check_fsctl(ctx, vnode_mount(vp), uap->cmd))) {
+ file_drop(fd);
+ vnode_put(vp);
+ return error;
+ }
#endif
- if ( (error = vnode_getwithref(vp)) ) {
- goto out;
+
+ error = fsctl_internal(p, &vp, uap->cmd, (user_addr_t)uap->data, uap->options, ctx);
+
+ file_drop(fd);
+
+ /*validate vp; fsctl_internal() can drop iocount and reset vp to NULL*/
+ if (vp) {
+ vnode_put(vp);
}
- AUDIT_ARG(vnpath, vp, ARG_VNODE1);
-unionread:
- if (vp->v_type != VDIR) {
- (void)vnode_put(vp);
- error = EINVAL;
- goto out;
+ return error;
+}
+/* end of fsctl system call */
+
+#define FILESEC_ACCESS_ENTITLEMENT \
+ "com.apple.private.vfs.filesec-access"
+
+static int
+xattr_entitlement_check(const char *attrname, vfs_context_t ctx, bool setting)
+{
+ if (strcmp(attrname, KAUTH_FILESEC_XATTR) == 0) {
+ /*
+ * get: root and tasks with FILESEC_ACCESS_ENTITLEMENT.
+ * set: only tasks with FILESEC_ACCESS_ENTITLEMENT.
+ */
+ if ((!setting && vfs_context_issuser(ctx)) ||
+ IOTaskHasEntitlement(current_task(),
+ FILESEC_ACCESS_ENTITLEMENT)) {
+ return 0;
+ }
}
-#if CONFIG_MACF
- error = mac_vnode_check_readdir(&context, vp);
+ return EPERM;
+}
+
+/*
+ * Retrieve the data of an extended attribute.
+ */
+int
+getxattr(proc_t p, struct getxattr_args *uap, user_ssize_t *retval)
+{
+ vnode_t vp;
+ struct nameidata nd;
+ char attrname[XATTR_MAXNAMELEN + 1];
+ vfs_context_t ctx = vfs_context_current();
+ uio_t auio = NULL;
+ int spacetype = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
+ size_t attrsize = 0;
+ size_t namelen;
+ u_int32_t nameiflags;
+ int error;
+ char uio_buf[UIO_SIZEOF(1)];
+
+ if (uap->options & (XATTR_NOSECURITY | XATTR_NODEFAULT)) {
+ return EINVAL;
+ }
+
+ nameiflags = (uap->options & XATTR_NOFOLLOW) ? 0 : FOLLOW;
+ NDINIT(&nd, LOOKUP, OP_GETXATTR, nameiflags, spacetype, uap->path, ctx);
+ if ((error = namei(&nd))) {
+ return error;
+ }
+ vp = nd.ni_vp;
+ nameidone(&nd);
+
+ error = copyinstr(uap->attrname, attrname, sizeof(attrname), &namelen);
if (error != 0) {
- (void)vnode_put(vp);
goto out;
}
-#endif /* MAC */
+ if (xattr_protected(attrname) &&
+ (error = xattr_entitlement_check(attrname, ctx, false)) != 0) {
+ goto out;
+ }
+ /*
+ * the specific check for 0xffffffff is a hack to preserve
+ * binaray compatibilty in K64 with applications that discovered
+ * that passing in a buf pointer and a size of -1 resulted in
+ * just the size of the indicated extended attribute being returned.
+ * this isn't part of the documented behavior, but because of the
+ * original implemtation's check for "uap->size > 0", this behavior
+ * was allowed. In K32 that check turned into a signed comparison
+ * even though uap->size is unsigned... in K64, we blow by that
+ * check because uap->size is unsigned and doesn't get sign smeared
+ * in the munger for a 32 bit user app. we also need to add a
+ * check to limit the maximum size of the buffer being passed in...
+ * unfortunately, the underlying fileystems seem to just malloc
+ * the requested size even if the actual extended attribute is tiny.
+ * because that malloc is for kernel wired memory, we have to put a
+ * sane limit on it.
+ *
+ * U32 running on K64 will yield 0x00000000ffffffff for uap->size
+ * U64 running on K64 will yield -1 (64 bits wide)
+ * U32/U64 running on K32 will yield -1 (32 bits wide)
+ */
+ if (uap->size == 0xffffffff || uap->size == (size_t)-1) {
+ goto no_uio;
+ }
- loff = fp->f_fglob->fg_offset;
- auio = uio_createwithbuffer(1, loff, spacetype, UIO_READ, &uio_buf[0], sizeof(uio_buf));
- uio_addiov(auio, bufp, bufsize);
+ if (uap->value) {
+ if (uap->size > (size_t)XATTR_MAXSIZE) {
+ uap->size = XATTR_MAXSIZE;
+ }
- if (flags & VNODE_READDIR_EXTENDED) {
- error = vnode_readdir64(vp, auio, flags, &eofflag, &numdirent, &context);
- fp->f_fglob->fg_offset = uio_offset(auio);
+ auio = uio_createwithbuffer(1, uap->position, spacetype, UIO_READ,
+ &uio_buf[0], sizeof(uio_buf));
+ uio_addiov(auio, uap->value, uap->size);
+ }
+no_uio:
+ error = vn_getxattr(vp, attrname, auio, &attrsize, uap->options, ctx);
+out:
+ vnode_put(vp);
+
+ if (auio) {
+ *retval = uap->size - uio_resid(auio);
} else {
- error = VNOP_READDIR(vp, auio, 0, &eofflag, &numdirent, &context);
- fp->f_fglob->fg_offset = uio_offset(auio);
+ *retval = (user_ssize_t)attrsize;
+ }
+
+ return error;
+}
+
+/*
+ * Retrieve the data of an extended attribute.
+ */
+int
+fgetxattr(proc_t p, struct fgetxattr_args *uap, user_ssize_t *retval)
+{
+ vnode_t vp;
+ char attrname[XATTR_MAXNAMELEN + 1];
+ vfs_context_t ctx = vfs_context_current();
+ uio_t auio = NULL;
+ int spacetype = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
+ size_t attrsize = 0;
+ size_t namelen;
+ int error;
+ char uio_buf[UIO_SIZEOF(1)];
+
+ if (uap->options & (XATTR_NOFOLLOW | XATTR_NOSECURITY | XATTR_NODEFAULT)) {
+ return EINVAL;
+ }
+
+ if ((error = file_vnode(uap->fd, &vp))) {
+ return error;
+ }
+ if ((error = vnode_getwithref(vp))) {
+ file_drop(uap->fd);
+ return error;
}
- if (error) {
- (void)vnode_put(vp);
+ error = copyinstr(uap->attrname, attrname, sizeof(attrname), &namelen);
+ if (error != 0) {
goto out;
}
-
- if ((user_ssize_t)bufsize == uio_resid(auio)){
- if (union_dircheckp) {
- error = union_dircheckp(&vp, fp, &context);
- if (error == -1)
- goto unionread;
- if (error)
- goto out;
- }
-
- if ((vp->v_flag & VROOT) && (vp->v_mount->mnt_flag & MNT_UNION)) {
- struct vnode *tvp = vp;
- vp = vp->v_mount->mnt_vnodecovered;
- vnode_getwithref(vp);
- vnode_ref(vp);
- fp->f_fglob->fg_data = (caddr_t) vp;
- fp->f_fglob->fg_offset = 0;
- vnode_rele(tvp);
- vnode_put(tvp);
- goto unionread;
- }
+ if (xattr_protected(attrname) &&
+ (error = xattr_entitlement_check(attrname, ctx, false)) != 0) {
+ goto out;
}
-
- vnode_put(vp);
- if (offset) {
- *offset = loff;
+ if (uap->value && uap->size > 0) {
+ auio = uio_createwithbuffer(1, uap->position, spacetype, UIO_READ,
+ &uio_buf[0], sizeof(uio_buf));
+ uio_addiov(auio, uap->value, uap->size);
}
- // LP64todo - fix this
- *bytesread = bufsize - uio_resid(auio);
+
+ error = vn_getxattr(vp, attrname, auio, &attrsize, uap->options, vfs_context_current());
out:
- file_drop(fd);
- return (error);
-}
+ (void)vnode_put(vp);
+ file_drop(uap->fd);
+ if (auio) {
+ *retval = uap->size - uio_resid(auio);
+ } else {
+ *retval = (user_ssize_t)attrsize;
+ }
+ return error;
+}
+/*
+ * Set the data of an extended attribute.
+ */
int
-getdirentries(__unused struct proc *p, struct getdirentries_args *uap, register_t *retval)
+setxattr(proc_t p, struct setxattr_args *uap, int *retval)
{
- off_t offset;
- long loff;
- ssize_t bytesread;
+ vnode_t vp;
+ struct nameidata nd;
+ char attrname[XATTR_MAXNAMELEN + 1];
+ vfs_context_t ctx = vfs_context_current();
+ uio_t auio = NULL;
+ int spacetype = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
+ size_t namelen;
+ u_int32_t nameiflags;
int error;
+ char uio_buf[UIO_SIZEOF(1)];
- AUDIT_ARG(fd, uap->fd);
- error = getdirentries_common(uap->fd, uap->buf, uap->count, &bytesread, &offset, 0);
+ if (uap->options & (XATTR_NOSECURITY | XATTR_NODEFAULT)) {
+ return EINVAL;
+ }
- if (error == 0) {
- loff = (long)offset;
- error = copyout((caddr_t)&loff, uap->basep, sizeof(long));
- *retval = bytesread;
+ error = copyinstr(uap->attrname, attrname, sizeof(attrname), &namelen);
+ if (error != 0) {
+ if (error == EPERM) {
+ /* if the string won't fit in attrname, copyinstr emits EPERM */
+ return ENAMETOOLONG;
+ }
+ /* Otherwise return the default error from copyinstr to detect ERANGE, etc */
+ return error;
+ }
+ if (xattr_protected(attrname) &&
+ (error = xattr_entitlement_check(attrname, ctx, true)) != 0) {
+ return error;
+ }
+ if (uap->size != 0 && uap->value == 0) {
+ return EINVAL;
+ }
+ if (uap->size > INT_MAX) {
+ return E2BIG;
}
- return (error);
-}
-int
-getdirentries64(__unused struct proc *p, struct getdirentries64_args *uap, user_ssize_t *retval)
-{
- off_t offset;
- ssize_t bytesread;
- int error;
+ nameiflags = (uap->options & XATTR_NOFOLLOW) ? 0 : FOLLOW;
+ NDINIT(&nd, LOOKUP, OP_SETXATTR, nameiflags, spacetype, uap->path, ctx);
+ if ((error = namei(&nd))) {
+ return error;
+ }
+ vp = nd.ni_vp;
+ nameidone(&nd);
- AUDIT_ARG(fd, uap->fd);
- error = getdirentries_common(uap->fd, uap->buf, uap->bufsize, &bytesread, &offset, VNODE_READDIR_EXTENDED);
+ auio = uio_createwithbuffer(1, uap->position, spacetype, UIO_WRITE,
+ &uio_buf[0], sizeof(uio_buf));
+ uio_addiov(auio, uap->value, uap->size);
+ error = vn_setxattr(vp, attrname, auio, uap->options, ctx);
+#if CONFIG_FSE
if (error == 0) {
- *retval = bytesread;
- error = copyout((caddr_t)&offset, uap->position, sizeof(off_t));
+ add_fsevent(FSE_XATTR_MODIFIED, ctx,
+ FSE_ARG_VNODE, vp,
+ FSE_ARG_DONE);
}
- return (error);
+#endif
+ vnode_put(vp);
+ *retval = 0;
+ return error;
}
-
/*
- * Set the mode mask for creation of filesystem nodes.
+ * Set the data of an extended attribute.
*/
-#warning XXX implement xsecurity
-
-#define UMASK_NOXSECURITY (void *)1 /* leave existing xsecurity alone */
-static int
-umask1(proc_t p, int newmask, __unused kauth_filesec_t fsec, register_t *retval)
-{
- struct filedesc *fdp;
-
- AUDIT_ARG(mask, newmask);
- proc_fdlock(p);
- fdp = p->p_fd;
- *retval = fdp->fd_cmask;
- fdp->fd_cmask = newmask & ALLPERMS;
- proc_fdunlock(p);
- return (0);
-}
-
-
int
-umask_extended(proc_t p, struct umask_extended_args *uap, register_t *retval)
+fsetxattr(proc_t p, struct fsetxattr_args *uap, int *retval)
{
- int ciferror;
- kauth_filesec_t xsecdst;
+ vnode_t vp;
+ char attrname[XATTR_MAXNAMELEN + 1];
+ vfs_context_t ctx = vfs_context_current();
+ uio_t auio = NULL;
+ int spacetype = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
+ size_t namelen;
+ int error;
+ char uio_buf[UIO_SIZEOF(1)];
- xsecdst = KAUTH_FILESEC_NONE;
- if (uap->xsecurity != USER_ADDR_NULL) {
- if ((ciferror = kauth_copyinfilesec(uap->xsecurity, &xsecdst)) != 0)
- return ciferror;
- } else {
- xsecdst = KAUTH_FILESEC_NONE;
+ if (uap->options & (XATTR_NOFOLLOW | XATTR_NOSECURITY | XATTR_NODEFAULT)) {
+ return EINVAL;
}
- ciferror = umask1(p, uap->newmask, xsecdst, retval);
-
- if (xsecdst != KAUTH_FILESEC_NONE)
- kauth_filesec_free(xsecdst);
- return ciferror;
-}
+ error = copyinstr(uap->attrname, attrname, sizeof(attrname), &namelen);
+ if (error != 0) {
+ if (error == EPERM) {
+ /* if the string won't fit in attrname, copyinstr emits EPERM */
+ return ENAMETOOLONG;
+ }
+ /* Otherwise return the default error from copyinstr to detect ERANGE, etc */
+ return error;
+ }
+ if (xattr_protected(attrname) &&
+ (error = xattr_entitlement_check(attrname, ctx, true)) != 0) {
+ return error;
+ }
+ if (uap->size != 0 && uap->value == 0) {
+ return EINVAL;
+ }
+ if (uap->size > INT_MAX) {
+ return E2BIG;
+ }
+ if ((error = file_vnode(uap->fd, &vp))) {
+ return error;
+ }
+ if ((error = vnode_getwithref(vp))) {
+ file_drop(uap->fd);
+ return error;
+ }
+ auio = uio_createwithbuffer(1, uap->position, spacetype, UIO_WRITE,
+ &uio_buf[0], sizeof(uio_buf));
+ uio_addiov(auio, uap->value, uap->size);
-int
-umask(proc_t p, struct umask_args *uap, register_t *retval)
-{
- return(umask1(p, uap->newmask, UMASK_NOXSECURITY, retval));
+ error = vn_setxattr(vp, attrname, auio, uap->options, vfs_context_current());
+#if CONFIG_FSE
+ if (error == 0) {
+ add_fsevent(FSE_XATTR_MODIFIED, ctx,
+ FSE_ARG_VNODE, vp,
+ FSE_ARG_DONE);
+ }
+#endif
+ vnode_put(vp);
+ file_drop(uap->fd);
+ *retval = 0;
+ return error;
}
/*
- * Void all references to file by ripping underlying filesystem
- * away from vnode.
+ * Remove an extended attribute.
+ * XXX Code duplication here.
*/
-/* ARGSUSED */
int
-revoke(proc_t p, struct revoke_args *uap, __unused register_t *retval)
+removexattr(proc_t p, struct removexattr_args *uap, int *retval)
{
vnode_t vp;
- struct vnode_attr va;
+ struct nameidata nd;
+ char attrname[XATTR_MAXNAMELEN + 1];
+ int spacetype = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
vfs_context_t ctx = vfs_context_current();
+ size_t namelen;
+ u_int32_t nameiflags;
int error;
- struct nameidata nd;
- NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
- error = namei(&nd);
- if (error)
- return (error);
- vp = nd.ni_vp;
+ if (uap->options & (XATTR_NOSECURITY | XATTR_NODEFAULT)) {
+ return EINVAL;
+ }
+ error = copyinstr(uap->attrname, attrname, sizeof(attrname), &namelen);
+ if (error != 0) {
+ return error;
+ }
+ if (xattr_protected(attrname)) {
+ return EPERM;
+ }
+ nameiflags = (uap->options & XATTR_NOFOLLOW) ? 0 : FOLLOW;
+ NDINIT(&nd, LOOKUP, OP_REMOVEXATTR, nameiflags, spacetype, uap->path, ctx);
+ if ((error = namei(&nd))) {
+ return error;
+ }
+ vp = nd.ni_vp;
nameidone(&nd);
-#if CONFIG_MACF
- error = mac_vnode_check_revoke(ctx, vp);
- if (error)
- goto out;
+ error = vn_removexattr(vp, attrname, uap->options, ctx);
+#if CONFIG_FSE
+ if (error == 0) {
+ add_fsevent(FSE_XATTR_REMOVED, ctx,
+ FSE_ARG_VNODE, vp,
+ FSE_ARG_DONE);
+ }
#endif
-
- VATTR_INIT(&va);
- VATTR_WANTED(&va, va_uid);
- if ((error = vnode_getattr(vp, &va, ctx)))
- goto out;
- if (kauth_cred_getuid(vfs_context_ucred(ctx)) != va.va_uid &&
- (error = suser(vfs_context_ucred(ctx), &p->p_acflag)))
- goto out;
- if (vp->v_usecount > 1 || (vp->v_flag & VALIASED))
- VNOP_REVOKE(vp, REVOKEALL, ctx);
-out:
vnode_put(vp);
- return (error);
+ *retval = 0;
+ return error;
}
-
/*
- * HFS/HFS PlUS SPECIFIC SYSTEM CALLS
- * The following system calls are designed to support features
- * which are specific to the HFS & HFS Plus volume formats
+ * Remove an extended attribute.
+ * XXX Code duplication here.
*/
+int
+fremovexattr(__unused proc_t p, struct fremovexattr_args *uap, int *retval)
+{
+ vnode_t vp;
+ char attrname[XATTR_MAXNAMELEN + 1];
+ size_t namelen;
+ int error;
+#if CONFIG_FSE
+ vfs_context_t ctx = vfs_context_current();
+#endif
-#ifdef __APPLE_API_OBSOLETE
+ if (uap->options & (XATTR_NOFOLLOW | XATTR_NOSECURITY | XATTR_NODEFAULT)) {
+ return EINVAL;
+ }
-/************************************************/
-/* *** Following calls will be deleted soon *** */
-/************************************************/
+ error = copyinstr(uap->attrname, attrname, sizeof(attrname), &namelen);
+ if (error != 0) {
+ return error;
+ }
+ if (xattr_protected(attrname)) {
+ return EPERM;
+ }
+ if ((error = file_vnode(uap->fd, &vp))) {
+ return error;
+ }
+ if ((error = vnode_getwithref(vp))) {
+ file_drop(uap->fd);
+ return error;
+ }
-/*
- * Make a complex file. A complex file is one with multiple forks (data streams)
- */
-/* ARGSUSED */
-int
-mkcomplex(__unused proc_t p, __unused struct mkcomplex_args *uap, __unused register_t *retval)
-{
- return (ENOTSUP);
+ error = vn_removexattr(vp, attrname, uap->options, vfs_context_current());
+#if CONFIG_FSE
+ if (error == 0) {
+ add_fsevent(FSE_XATTR_REMOVED, ctx,
+ FSE_ARG_VNODE, vp,
+ FSE_ARG_DONE);
+ }
+#endif
+ vnode_put(vp);
+ file_drop(uap->fd);
+ *retval = 0;
+ return error;
}
/*
- * Extended stat call which returns volumeid and vnodeid as well as other info
+ * Retrieve the list of extended attribute names.
+ * XXX Code duplication here.
*/
-/* ARGSUSED */
-int
-statv(__unused proc_t p,
- __unused struct statv_args *uap,
- __unused register_t *retval)
-{
- return (ENOTSUP); /* We'll just return an error for now */
-
-} /* end of statv system call */
-
-/*
-* Extended lstat call which returns volumeid and vnodeid as well as other info
-*/
-/* ARGSUSED */
int
-lstatv(__unused proc_t p,
- __unused struct lstatv_args *uap,
- __unused register_t *retval)
+listxattr(proc_t p, struct listxattr_args *uap, user_ssize_t *retval)
{
- return (ENOTSUP); /* We'll just return an error for now */
-} /* end of lstatv system call */
+ vnode_t vp;
+ struct nameidata nd;
+ vfs_context_t ctx = vfs_context_current();
+ uio_t auio = NULL;
+ int spacetype = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
+ size_t attrsize = 0;
+ u_int32_t nameiflags;
+ int error;
+ char uio_buf[UIO_SIZEOF(1)];
-/*
-* Extended fstat call which returns volumeid and vnodeid as well as other info
-*/
-/* ARGSUSED */
-int
-fstatv(__unused proc_t p,
- __unused struct fstatv_args *uap,
- __unused register_t *retval)
-{
- return (ENOTSUP); /* We'll just return an error for now */
-} /* end of fstatv system call */
+ if (uap->options & (XATTR_NOSECURITY | XATTR_NODEFAULT)) {
+ return EINVAL;
+ }
+ nameiflags = (uap->options & XATTR_NOFOLLOW) ? 0 : FOLLOW;
+ NDINIT(&nd, LOOKUP, OP_LISTXATTR, nameiflags, spacetype, uap->path, ctx);
+ if ((error = namei(&nd))) {
+ return error;
+ }
+ vp = nd.ni_vp;
+ nameidone(&nd);
+ if (uap->namebuf != 0 && uap->bufsize > 0) {
+ auio = uio_createwithbuffer(1, 0, spacetype, UIO_READ,
+ &uio_buf[0], sizeof(uio_buf));
+ uio_addiov(auio, uap->namebuf, uap->bufsize);
+ }
-/************************************************/
-/* *** Preceding calls will be deleted soon *** */
-/************************************************/
+ error = vn_listxattr(vp, auio, &attrsize, uap->options, ctx);
-#endif /* __APPLE_API_OBSOLETE */
+ vnode_put(vp);
+ if (auio) {
+ *retval = (user_ssize_t)uap->bufsize - uio_resid(auio);
+ } else {
+ *retval = (user_ssize_t)attrsize;
+ }
+ return error;
+}
/*
-* Obtain attribute information on objects in a directory while enumerating
-* the directory. This call does not yet support union mounted directories.
-* TO DO
-* 1.union mounted directories.
-*/
-
-/* ARGSUSED */
+ * Retrieve the list of extended attribute names.
+ * XXX Code duplication here.
+ */
int
-getdirentriesattr (proc_t p, struct getdirentriesattr_args *uap, register_t *retval)
+flistxattr(proc_t p, struct flistxattr_args *uap, user_ssize_t *retval)
{
vnode_t vp;
- struct fileproc *fp;
uio_t auio = NULL;
int spacetype = proc_is64bit(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
- uint32_t count;
- uint32_t newstate;
- int error, eofflag;
- uint32_t loff;
- struct attrlist attributelist;
- vfs_context_t ctx = vfs_context_current();
- int fd = uap->fd;
- char uio_buf[ UIO_SIZEOF(1) ];
- kauth_action_t action;
+ size_t attrsize = 0;
+ int error;
+ char uio_buf[UIO_SIZEOF(1)];
- AUDIT_ARG(fd, fd);
-
- /* Get the attributes into kernel space */
- if ((error = copyin(uap->alist, (caddr_t)&attributelist, sizeof(attributelist)))) {
- return(error);
+ if (uap->options & (XATTR_NOFOLLOW | XATTR_NOSECURITY | XATTR_NODEFAULT)) {
+ return EINVAL;
}
- if ((error = copyin(uap->count, (caddr_t)&count, sizeof(count)))) {
- return(error);
+
+ if ((error = file_vnode(uap->fd, &vp))) {
+ return error;
}
- if ( (error = fp_getfvp(p, fd, &fp, &vp)) ) {
- return (error);
+ if ((error = vnode_getwithref(vp))) {
+ file_drop(uap->fd);
+ return error;
}
- if ((fp->f_fglob->fg_flag & FREAD) == 0) {
- AUDIT_ARG(vnpath_withref, vp, ARG_VNODE1);
- error = EBADF;
- goto out;
+ if (uap->namebuf != 0 && uap->bufsize > 0) {
+ auio = uio_createwithbuffer(1, 0, spacetype,
+ UIO_READ, &uio_buf[0], sizeof(uio_buf));
+ uio_addiov(auio, uap->namebuf, uap->bufsize);
}
+ error = vn_listxattr(vp, auio, &attrsize, uap->options, vfs_context_current());
-#if CONFIG_MACF
- error = mac_file_check_change_offset(vfs_context_ucred(ctx),
- fp->f_fglob);
- if (error)
- goto out;
-#endif
-
-
- if ( (error = vnode_getwithref(vp)) )
- goto out;
+ vnode_put(vp);
+ file_drop(uap->fd);
+ if (auio) {
+ *retval = (user_ssize_t)uap->bufsize - uio_resid(auio);
+ } else {
+ *retval = (user_ssize_t)attrsize;
+ }
+ return error;
+}
- AUDIT_ARG(vnpath, vp, ARG_VNODE1);
+static int
+fsgetpath_internal(vfs_context_t ctx, int volfs_id, uint64_t objid,
+ vm_size_t bufsize, caddr_t buf, uint32_t options, int *pathlen)
+{
+ int error;
+ struct mount *mp = NULL;
+ vnode_t vp;
+ int length;
+ int bpflags;
+ /* maximum number of times to retry build_path */
+ unsigned int retries = 0x10;
- if (vp->v_type != VDIR) {
- (void)vnode_put(vp);
- error = EINVAL;
- goto out;
+ if (bufsize > PAGE_SIZE) {
+ return EINVAL;
}
-#if CONFIG_MACF
- error = mac_vnode_check_readdir(ctx, vp);
- if (error != 0) {
- (void)vnode_put(vp);
- goto out;
+ if (buf == NULL) {
+ return ENOMEM;
}
-#endif /* MAC */
-
- /* set up the uio structure which will contain the users return buffer */
- loff = fp->f_fglob->fg_offset;
- auio = uio_createwithbuffer(1, loff, spacetype, UIO_READ,
- &uio_buf[0], sizeof(uio_buf));
- uio_addiov(auio, uap->buffer, uap->buffersize);
-
- /*
- * If the only item requested is file names, we can let that past with
- * just LIST_DIRECTORY. If they want any other attributes, that means
- * they need SEARCH as well.
- */
- action = KAUTH_VNODE_LIST_DIRECTORY;
- if ((attributelist.commonattr & ~ATTR_CMN_NAME) ||
- attributelist.fileattr || attributelist.dirattr)
- action |= KAUTH_VNODE_SEARCH;
-
- if ((error = vnode_authorize(vp, NULL, action, ctx)) == 0) {
- u_long ulcount = count;
- error = VNOP_READDIRATTR(vp, &attributelist, auio,
- count,
- uap->options, (unsigned long *)&newstate, &eofflag,
- &ulcount, ctx);
- if (!error)
- count = ulcount;
+retry:
+ if ((mp = mount_lookupby_volfsid(volfs_id, 1)) == NULL) {
+ error = ENOTSUP; /* unexpected failure */
+ return ENOTSUP;
}
- (void)vnode_put(vp);
-
- if (error)
- goto out;
- fp->f_fglob->fg_offset = uio_offset(auio); /* should be multiple of dirent, not variable */
-
- if ((error = copyout((caddr_t) &count, uap->count, sizeof(count))))
- goto out;
- if ((error = copyout((caddr_t) &newstate, uap->newstate, sizeof(newstate))))
- goto out;
- if ((error = copyout((caddr_t) &loff, uap->basep, sizeof(loff))))
- goto out;
-
- *retval = eofflag; /* similar to getdirentries */
- error = 0;
-out:
- file_drop(fd);
- return (error); /* return error earlier, an retval of 0 or 1 now */
-
-} /* end of getdirentryattr system call */
-
-/*
-* Exchange data between two files
-*/
-
-/* ARGSUSED */
-int
-exchangedata (__unused proc_t p, struct exchangedata_args *uap, __unused register_t *retval)
-{
- struct nameidata fnd, snd;
- vfs_context_t ctx = vfs_context_current();
- vnode_t fvp;
- vnode_t svp;
- int error;
- u_long nameiflags;
- char *fpath = NULL;
- char *spath = NULL;
- int flen, slen;
- fse_info f_finfo, s_finfo;
+unionget:
+ if (objid == 2) {
+ struct vfs_attr vfsattr;
+ int use_vfs_root = TRUE;
- nameiflags = 0;
- if ((uap->options & FSOPT_NOFOLLOW) == 0) nameiflags |= FOLLOW;
+ VFSATTR_INIT(&vfsattr);
+ VFSATTR_WANTED(&vfsattr, f_capabilities);
+ if (!(options & FSOPT_ISREALFSID) &&
+ vfs_getattr(mp, &vfsattr, vfs_context_kernel()) == 0 &&
+ VFSATTR_IS_SUPPORTED(&vfsattr, f_capabilities)) {
+ if ((vfsattr.f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] & VOL_CAP_FMT_VOL_GROUPS) &&
+ (vfsattr.f_capabilities.valid[VOL_CAPABILITIES_FORMAT] & VOL_CAP_FMT_VOL_GROUPS)) {
+ use_vfs_root = FALSE;
+ }
+ }
- NDINIT(&fnd, LOOKUP, nameiflags | AUDITVNPATH1,
- UIO_USERSPACE, uap->path1, ctx);
+ if (use_vfs_root) {
+ error = VFS_ROOT(mp, &vp, ctx);
+ } else {
+ error = VFS_VGET(mp, objid, &vp, ctx);
+ }
+ } else {
+ error = VFS_VGET(mp, (ino64_t)objid, &vp, ctx);
+ }
- error = namei(&fnd);
- if (error)
- goto out2;
+ if (error == ENOENT && (mp->mnt_flag & MNT_UNION)) {
+ /*
+ * If the fileid isn't found and we're in a union
+ * mount volume, then see if the fileid is in the
+ * mounted-on volume.
+ */
+ struct mount *tmp = mp;
+ mp = vnode_mount(tmp->mnt_vnodecovered);
+ vfs_unbusy(tmp);
+ if (vfs_busy(mp, LK_NOWAIT) == 0) {
+ goto unionget;
+ }
+ } else {
+ vfs_unbusy(mp);
+ }
- nameidone(&fnd);
- fvp = fnd.ni_vp;
+ if (error) {
+ return error;
+ }
- NDINIT(&snd, LOOKUP | CN_NBMOUNTLOOK, nameiflags | AUDITVNPATH2,
- UIO_USERSPACE, uap->path2, ctx);
+#if CONFIG_MACF
+ error = mac_vnode_check_fsgetpath(ctx, vp);
+ if (error) {
+ vnode_put(vp);
+ return error;
+ }
+#endif
- error = namei(&snd);
- if (error) {
- vnode_put(fvp);
- goto out2;
- }
- nameidone(&snd);
- svp = snd.ni_vp;
+ /* Obtain the absolute path to this vnode. */
+ bpflags = vfs_context_suser(ctx) ? BUILDPATH_CHECKACCESS : 0;
+ if (options & FSOPT_NOFIRMLINKPATH) {
+ bpflags |= BUILDPATH_NO_FIRMLINK;
+ }
+ bpflags |= BUILDPATH_CHECK_MOVED;
+ error = build_path(vp, buf, (int)bufsize, &length, bpflags, ctx);
+ vnode_put(vp);
- /*
- * if the files are the same, return an inval error
- */
- if (svp == fvp) {
- error = EINVAL;
- goto out;
- }
+ if (error) {
+ /* there was a race building the path, try a few more times */
+ if (error == EAGAIN) {
+ --retries;
+ if (retries > 0) {
+ goto retry;
+ }
- /*
- * if the files are on different volumes, return an error
- */
- if (svp->v_mount != fvp->v_mount) {
- error = EXDEV;
+ error = ENOENT;
+ }
goto out;
}
-#if CONFIG_MACF
- error = mac_vnode_check_exchangedata(ctx,
- fvp, svp);
- if (error)
- goto out;
-#endif
- if (((error = vnode_authorize(fvp, NULL, KAUTH_VNODE_READ_DATA | KAUTH_VNODE_WRITE_DATA, ctx)) != 0) ||
- ((error = vnode_authorize(svp, NULL, KAUTH_VNODE_READ_DATA | KAUTH_VNODE_WRITE_DATA, ctx)) != 0))
- goto out;
+ AUDIT_ARG(text, buf);
- if (
-#if CONFIG_FSE
- need_fsevent(FSE_EXCHANGE, fvp) ||
-#endif
- kauth_authorize_fileop_has_listeners()) {
- GET_PATH(fpath);
- GET_PATH(spath);
- if (fpath == NULL || spath == NULL) {
- error = ENOMEM;
- goto out;
- }
- flen = MAXPATHLEN;
- slen = MAXPATHLEN;
- if (vn_getpath(fvp, fpath, &flen) != 0 || fpath[0] == '\0') {
- printf("exchange: vn_getpath(fvp=%p) failed <<%s>>\n",
- fvp, fpath);
- }
- if (vn_getpath(svp, spath, &slen) != 0 || spath[0] == '\0') {
- printf("exchange: vn_getpath(svp=%p) failed <<%s>>\n",
- svp, spath);
- }
-#if CONFIG_FSE
- get_fse_info(fvp, &f_finfo, ctx);
- get_fse_info(svp, &s_finfo, ctx);
-#endif
- }
- /* Ok, make the call */
- error = VNOP_EXCHANGE(fvp, svp, 0, ctx);
+ if (kdebug_debugid_enabled(VFS_LOOKUP) && length > 0) {
+ unsigned long path_words[NUMPARMS];
+ size_t path_len = sizeof(path_words);
- if (error == 0) {
- const char *tmpname;
+ if ((size_t)length < path_len) {
+ memcpy((char *)path_words, buf, length);
+ memset((char *)path_words + length, 0, path_len - length);
- if (fpath != NULL && spath != NULL) {
- /* call out to allow 3rd party notification of exchangedata.
- * Ignore result of kauth_authorize_fileop call.
- */
- kauth_authorize_fileop(vfs_context_ucred(ctx), KAUTH_FILEOP_EXCHANGE,
- (uintptr_t)fpath, (uintptr_t)spath);
- }
- name_cache_lock();
-
- tmpname = fvp->v_name;
- fvp->v_name = svp->v_name;
- svp->v_name = tmpname;
-
- if (fvp->v_parent != svp->v_parent) {
- vnode_t tmp;
-
- tmp = fvp->v_parent;
- fvp->v_parent = svp->v_parent;
- svp->v_parent = tmp;
- }
- name_cache_unlock();
+ path_len = length;
+ } else {
+ memcpy((char *)path_words, buf + (length - path_len), path_len);
+ }
-#if CONFIG_FSE
- if (fpath != NULL && spath != NULL) {
- add_fsevent(FSE_EXCHANGE, ctx,
- FSE_ARG_STRING, flen, fpath,
- FSE_ARG_FINFO, &f_finfo,
- FSE_ARG_STRING, slen, spath,
- FSE_ARG_FINFO, &s_finfo,
- FSE_ARG_DONE);
- }
-#endif
+ kdebug_vfs_lookup(path_words, (int)path_len, vp,
+ KDBG_VFS_LOOKUP_FLAG_LOOKUP);
}
+ *pathlen = length; /* may be superseded by error */
+
out:
- if (fpath != NULL)
- RELEASE_PATH(fpath);
- if (spath != NULL)
- RELEASE_PATH(spath);
- vnode_put(svp);
- vnode_put(fvp);
-out2:
- return (error);
+ return error;
}
-
-/* ARGSUSED */
-
-int
-searchfs(proc_t p, struct searchfs_args *uap, __unused register_t *retval)
+/*
+ * Obtain the full pathname of a file system object by id.
+ */
+static int
+fsgetpath_extended(user_addr_t buf, user_size_t bufsize, user_addr_t user_fsid, uint64_t objid,
+ uint32_t options, user_ssize_t *retval)
{
- vnode_t vp;
- int error=0;
- int fserror = 0;
- struct nameidata nd;
- struct user_fssearchblock searchblock;
- struct searchstate *state;
- struct attrlist *returnattrs;
- void *searchparams1,*searchparams2;
- uio_t auio = NULL;
- int spacetype = proc_is64bit(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
- u_long nummatches;
- int mallocsize;
- u_long nameiflags;
vfs_context_t ctx = vfs_context_current();
- char uio_buf[ UIO_SIZEOF(1) ];
-
- /* Start by copying in fsearchblock paramater list */
- if (IS_64BIT_PROCESS(p)) {
- error = copyin(uap->searchblock, (caddr_t) &searchblock, sizeof(searchblock));
- }
- else {
- struct fssearchblock tmp_searchblock;
- error = copyin(uap->searchblock, (caddr_t) &tmp_searchblock, sizeof(tmp_searchblock));
- // munge into 64-bit version
- searchblock.returnattrs = CAST_USER_ADDR_T(tmp_searchblock.returnattrs);
- searchblock.returnbuffer = CAST_USER_ADDR_T(tmp_searchblock.returnbuffer);
- searchblock.returnbuffersize = tmp_searchblock.returnbuffersize;
- searchblock.maxmatches = tmp_searchblock.maxmatches;
- searchblock.timelimit.tv_sec = tmp_searchblock.timelimit.tv_sec;
- searchblock.timelimit.tv_usec = tmp_searchblock.timelimit.tv_usec;
- searchblock.searchparams1 = CAST_USER_ADDR_T(tmp_searchblock.searchparams1);
- searchblock.sizeofsearchparams1 = tmp_searchblock.sizeofsearchparams1;
- searchblock.searchparams2 = CAST_USER_ADDR_T(tmp_searchblock.searchparams2);
- searchblock.sizeofsearchparams2 = tmp_searchblock.sizeofsearchparams2;
- searchblock.searchattrs = tmp_searchblock.searchattrs;
- }
- if (error)
- return(error);
-
- /* Do a sanity check on sizeofsearchparams1 and sizeofsearchparams2.
- */
- if (searchblock.sizeofsearchparams1 > SEARCHFS_MAX_SEARCHPARMS ||
- searchblock.sizeofsearchparams2 > SEARCHFS_MAX_SEARCHPARMS)
- return(EINVAL);
-
- /* Now malloc a big bunch of space to hold the search parameters, the attrlists and the search state. */
- /* It all has to do into local memory and it's not that big so we might as well put it all together. */
- /* Searchparams1 shall be first so we might as well use that to hold the base address of the allocated*/
- /* block. */
-
- mallocsize = searchblock.sizeofsearchparams1 + searchblock.sizeofsearchparams2 +
- sizeof(struct attrlist) + sizeof(struct searchstate);
-
- MALLOC(searchparams1, void *, mallocsize, M_TEMP, M_WAITOK);
-
- /* Now set up the various pointers to the correct place in our newly allocated memory */
+ fsid_t fsid;
+ char *realpath;
+ int length;
+ int error;
- searchparams2 = (void *) (((caddr_t) searchparams1) + searchblock.sizeofsearchparams1);
- returnattrs = (struct attrlist *) (((caddr_t) searchparams2) + searchblock.sizeofsearchparams2);
- state = (struct searchstate *) (((caddr_t) returnattrs) + sizeof (struct attrlist));
+ if (options & ~(FSOPT_NOFIRMLINKPATH | FSOPT_ISREALFSID)) {
+ return EINVAL;
+ }
- /* Now copy in the stuff given our local variables. */
+ if ((error = copyin(user_fsid, (caddr_t)&fsid, sizeof(fsid)))) {
+ return error;
+ }
+ AUDIT_ARG(value32, fsid.val[0]);
+ AUDIT_ARG(value64, objid);
+ /* Restrict output buffer size for now. */
- if ((error = copyin(searchblock.searchparams1, searchparams1, searchblock.sizeofsearchparams1)))
- goto freeandexit;
+ if (bufsize > PAGE_SIZE || bufsize <= 0) {
+ return EINVAL;
+ }
+ realpath = kheap_alloc(KHEAP_TEMP, bufsize, Z_WAITOK | Z_ZERO);
+ if (realpath == NULL) {
+ return ENOMEM;
+ }
- if ((error = copyin(searchblock.searchparams2, searchparams2, searchblock.sizeofsearchparams2)))
- goto freeandexit;
+ error = fsgetpath_internal(ctx, fsid.val[0], objid, bufsize, realpath,
+ options, &length);
- if ((error = copyin(searchblock.returnattrs, (caddr_t) returnattrs, sizeof(struct attrlist))))
- goto freeandexit;
-
- if ((error = copyin(uap->state, (caddr_t) state, sizeof(struct searchstate))))
- goto freeandexit;
-
- /* set up the uio structure which will contain the users return buffer */
+ if (error) {
+ goto out;
+ }
- auio = uio_createwithbuffer(1, 0, spacetype, UIO_READ,
- &uio_buf[0], sizeof(uio_buf));
- uio_addiov(auio, searchblock.returnbuffer, searchblock.returnbuffersize);
+ error = copyout((caddr_t)realpath, buf, length);
- nameiflags = 0;
- if ((uap->options & FSOPT_NOFOLLOW) == 0) nameiflags |= FOLLOW;
- NDINIT(&nd, LOOKUP, nameiflags | AUDITVNPATH1,
- UIO_USERSPACE, uap->path, ctx);
+ *retval = (user_ssize_t)length; /* may be superseded by error */
+out:
+ kheap_free(KHEAP_TEMP, realpath, bufsize);
+ return error;
+}
- error = namei(&nd);
- if (error)
- goto freeandexit;
+int
+fsgetpath(__unused proc_t p, struct fsgetpath_args *uap, user_ssize_t *retval)
+{
+ return fsgetpath_extended(uap->buf, uap->bufsize, uap->fsid, uap->objid,
+ 0, retval);
+}
- nameidone(&nd);
- vp = nd.ni_vp;
+int
+fsgetpath_ext(__unused proc_t p, struct fsgetpath_ext_args *uap, user_ssize_t *retval)
+{
+ return fsgetpath_extended(uap->buf, uap->bufsize, uap->fsid, uap->objid,
+ uap->options, retval);
+}
-
- /*
- * If searchblock.maxmatches == 0, then skip the search. This has happened
- * before and sometimes the underlyning code doesnt deal with it well.
- */
- if (searchblock.maxmatches == 0) {
- nummatches = 0;
- goto saveandexit;
- }
+/*
+ * Common routine to handle various flavors of statfs data heading out
+ * to user space.
+ *
+ * Returns: 0 Success
+ * EFAULT
+ */
+static int
+munge_statfs(struct mount *mp, struct vfsstatfs *sfsp,
+ user_addr_t bufp, int *sizep, boolean_t is_64_bit,
+ boolean_t partial_copy)
+{
+ int error;
+ int my_size, copy_size;
- /*
- Allright, we have everything we need, so lets make that call.
-
- We keep special track of the return value from the file system:
- EAGAIN is an acceptable error condition that shouldn't keep us
- from copying out any results...
- */
+ if (is_64_bit) {
+ struct user64_statfs sfs;
+ my_size = copy_size = sizeof(sfs);
+ bzero(&sfs, my_size);
+ sfs.f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+ sfs.f_type = (short)mp->mnt_vtable->vfc_typenum;
+ sfs.f_reserved1 = (short)sfsp->f_fssubtype;
+ sfs.f_bsize = (user64_long_t)sfsp->f_bsize;
+ sfs.f_iosize = (user64_long_t)sfsp->f_iosize;
+ sfs.f_blocks = (user64_long_t)sfsp->f_blocks;
+ sfs.f_bfree = (user64_long_t)sfsp->f_bfree;
+ sfs.f_bavail = (user64_long_t)sfsp->f_bavail;
+ sfs.f_files = (user64_long_t)sfsp->f_files;
+ sfs.f_ffree = (user64_long_t)sfsp->f_ffree;
+ sfs.f_fsid = sfsp->f_fsid;
+ sfs.f_owner = sfsp->f_owner;
+ if (mp->mnt_kern_flag & MNTK_TYPENAME_OVERRIDE) {
+ strlcpy(&sfs.f_fstypename[0], &mp->fstypename_override[0], MFSNAMELEN);
+ } else {
+ strlcpy(&sfs.f_fstypename[0], &sfsp->f_fstypename[0], MFSNAMELEN);
+ }
+ strlcpy(&sfs.f_mntonname[0], &sfsp->f_mntonname[0], MNAMELEN);
+ strlcpy(&sfs.f_mntfromname[0], &sfsp->f_mntfromname[0], MNAMELEN);
- fserror = VNOP_SEARCHFS(vp,
- searchparams1,
- searchparams2,
- &searchblock.searchattrs,
- searchblock.maxmatches,
- &searchblock.timelimit,
- returnattrs,
- &nummatches,
- uap->scriptcode,
- uap->options,
- auio,
- state,
- ctx);
-
-saveandexit:
+ if (partial_copy) {
+ copy_size -= (sizeof(sfs.f_reserved3) + sizeof(sfs.f_reserved4));
+ }
+ error = copyout((caddr_t)&sfs, bufp, copy_size);
+ } else {
+ struct user32_statfs sfs;
- vnode_put(vp);
+ my_size = copy_size = sizeof(sfs);
+ bzero(&sfs, my_size);
- /* Now copy out the stuff that needs copying out. That means the number of matches, the
- search state. Everything was already put into he return buffer by the vop call. */
+ sfs.f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+ sfs.f_type = (short)mp->mnt_vtable->vfc_typenum;
+ sfs.f_reserved1 = (short)sfsp->f_fssubtype;
- if ((error = copyout((caddr_t) state, uap->state, sizeof(struct searchstate))) != 0)
- goto freeandexit;
+ /*
+ * It's possible for there to be more than 2^^31 blocks in the filesystem, so we
+ * have to fudge the numbers here in that case. We inflate the blocksize in order
+ * to reflect the filesystem size as best we can.
+ */
+ if ((sfsp->f_blocks > INT_MAX)
+ /* Hack for 4061702 . I think the real fix is for Carbon to
+ * look for some volume capability and not depend on hidden
+ * semantics agreed between a FS and carbon.
+ * f_blocks, f_bfree, and f_bavail set to -1 is the trigger
+ * for Carbon to set bNoVolumeSizes volume attribute.
+ * Without this the webdavfs files cannot be copied onto
+ * disk as they look huge. This change should not affect
+ * XSAN as they should not setting these to -1..
+ */
+ && (sfsp->f_blocks != 0xffffffffffffffffULL)
+ && (sfsp->f_bfree != 0xffffffffffffffffULL)
+ && (sfsp->f_bavail != 0xffffffffffffffffULL)) {
+ int shift;
- if ((error = suulong(uap->nummatches, (uint64_t)nummatches)) != 0)
- goto freeandexit;
-
- error = fserror;
+ /*
+ * Work out how far we have to shift the block count down to make it fit.
+ * Note that it's possible to have to shift so far that the resulting
+ * blocksize would be unreportably large. At that point, we will clip
+ * any values that don't fit.
+ *
+ * For safety's sake, we also ensure that f_iosize is never reported as
+ * being smaller than f_bsize.
+ */
+ for (shift = 0; shift < 32; shift++) {
+ if ((sfsp->f_blocks >> shift) <= INT_MAX) {
+ break;
+ }
+ if ((sfsp->f_bsize << (shift + 1)) > INT_MAX) {
+ break;
+ }
+ }
+#define __SHIFT_OR_CLIP(x, s) ((((x) >> (s)) > INT_MAX) ? INT_MAX : ((x) >> (s)))
+ sfs.f_blocks = (user32_long_t)__SHIFT_OR_CLIP(sfsp->f_blocks, shift);
+ sfs.f_bfree = (user32_long_t)__SHIFT_OR_CLIP(sfsp->f_bfree, shift);
+ sfs.f_bavail = (user32_long_t)__SHIFT_OR_CLIP(sfsp->f_bavail, shift);
+#undef __SHIFT_OR_CLIP
+ sfs.f_bsize = (user32_long_t)(sfsp->f_bsize << shift);
+ sfs.f_iosize = (int)lmax(sfsp->f_iosize, sfsp->f_bsize);
+ } else {
+ /* filesystem is small enough to be reported honestly */
+ sfs.f_bsize = (user32_long_t)sfsp->f_bsize;
+ sfs.f_iosize = (user32_long_t)sfsp->f_iosize;
+ sfs.f_blocks = (user32_long_t)sfsp->f_blocks;
+ sfs.f_bfree = (user32_long_t)sfsp->f_bfree;
+ sfs.f_bavail = (user32_long_t)sfsp->f_bavail;
+ }
+ sfs.f_files = (user32_long_t)sfsp->f_files;
+ sfs.f_ffree = (user32_long_t)sfsp->f_ffree;
+ sfs.f_fsid = sfsp->f_fsid;
+ sfs.f_owner = sfsp->f_owner;
+ if (mp->mnt_kern_flag & MNTK_TYPENAME_OVERRIDE) {
+ strlcpy(&sfs.f_fstypename[0], &mp->fstypename_override[0], MFSNAMELEN);
+ } else {
+ strlcpy(&sfs.f_fstypename[0], &sfsp->f_fstypename[0], MFSNAMELEN);
+ }
+ strlcpy(&sfs.f_mntonname[0], &sfsp->f_mntonname[0], MNAMELEN);
+ strlcpy(&sfs.f_mntfromname[0], &sfsp->f_mntfromname[0], MNAMELEN);
-freeandexit:
+ if (partial_copy) {
+ copy_size -= (sizeof(sfs.f_reserved3) + sizeof(sfs.f_reserved4));
+ }
+ error = copyout((caddr_t)&sfs, bufp, copy_size);
+ }
- FREE(searchparams1,M_TEMP);
+ if (sizep != NULL) {
+ *sizep = my_size;
+ }
+ return error;
+}
- return(error);
+/*
+ * copy stat structure into user_stat structure.
+ */
+void
+munge_user64_stat(struct stat *sbp, struct user64_stat *usbp)
+{
+ bzero(usbp, sizeof(*usbp));
+ usbp->st_dev = sbp->st_dev;
+ usbp->st_ino = sbp->st_ino;
+ usbp->st_mode = sbp->st_mode;
+ usbp->st_nlink = sbp->st_nlink;
+ usbp->st_uid = sbp->st_uid;
+ usbp->st_gid = sbp->st_gid;
+ usbp->st_rdev = sbp->st_rdev;
+#ifndef _POSIX_C_SOURCE
+ usbp->st_atimespec.tv_sec = sbp->st_atimespec.tv_sec;
+ usbp->st_atimespec.tv_nsec = sbp->st_atimespec.tv_nsec;
+ usbp->st_mtimespec.tv_sec = sbp->st_mtimespec.tv_sec;
+ usbp->st_mtimespec.tv_nsec = sbp->st_mtimespec.tv_nsec;
+ usbp->st_ctimespec.tv_sec = sbp->st_ctimespec.tv_sec;
+ usbp->st_ctimespec.tv_nsec = sbp->st_ctimespec.tv_nsec;
+#else
+ usbp->st_atime = sbp->st_atime;
+ usbp->st_atimensec = sbp->st_atimensec;
+ usbp->st_mtime = sbp->st_mtime;
+ usbp->st_mtimensec = sbp->st_mtimensec;
+ usbp->st_ctime = sbp->st_ctime;
+ usbp->st_ctimensec = sbp->st_ctimensec;
+#endif
+ usbp->st_size = sbp->st_size;
+ usbp->st_blocks = sbp->st_blocks;
+ usbp->st_blksize = sbp->st_blksize;
+ usbp->st_flags = sbp->st_flags;
+ usbp->st_gen = sbp->st_gen;
+ usbp->st_lspare = sbp->st_lspare;
+ usbp->st_qspare[0] = sbp->st_qspare[0];
+ usbp->st_qspare[1] = sbp->st_qspare[1];
+}
-} /* end of searchfs system call */
+void
+munge_user32_stat(struct stat *sbp, struct user32_stat *usbp)
+{
+ bzero(usbp, sizeof(*usbp));
+ usbp->st_dev = sbp->st_dev;
+ usbp->st_ino = sbp->st_ino;
+ usbp->st_mode = sbp->st_mode;
+ usbp->st_nlink = sbp->st_nlink;
+ usbp->st_uid = sbp->st_uid;
+ usbp->st_gid = sbp->st_gid;
+ usbp->st_rdev = sbp->st_rdev;
+#ifndef _POSIX_C_SOURCE
+ usbp->st_atimespec.tv_sec = (user32_time_t)sbp->st_atimespec.tv_sec;
+ usbp->st_atimespec.tv_nsec = (user32_long_t)sbp->st_atimespec.tv_nsec;
+ usbp->st_mtimespec.tv_sec = (user32_time_t)sbp->st_mtimespec.tv_sec;
+ usbp->st_mtimespec.tv_nsec = (user32_long_t)sbp->st_mtimespec.tv_nsec;
+ usbp->st_ctimespec.tv_sec = (user32_time_t)sbp->st_ctimespec.tv_sec;
+ usbp->st_ctimespec.tv_nsec = (user32_long_t)sbp->st_ctimespec.tv_nsec;
+#else
+ usbp->st_atime = sbp->st_atime;
+ usbp->st_atimensec = sbp->st_atimensec;
+ usbp->st_mtime = sbp->st_mtime;
+ usbp->st_mtimensec = sbp->st_mtimensec;
+ usbp->st_ctime = sbp->st_ctime;
+ usbp->st_ctimensec = sbp->st_ctimensec;
+#endif
+ usbp->st_size = sbp->st_size;
+ usbp->st_blocks = sbp->st_blocks;
+ usbp->st_blksize = sbp->st_blksize;
+ usbp->st_flags = sbp->st_flags;
+ usbp->st_gen = sbp->st_gen;
+ usbp->st_lspare = sbp->st_lspare;
+ usbp->st_qspare[0] = sbp->st_qspare[0];
+ usbp->st_qspare[1] = sbp->st_qspare[1];
+}
/*
- * Make a filesystem-specific control call:
+ * copy stat64 structure into user_stat64 structure.
*/
-/* ARGSUSED */
-int
-fsctl (proc_t p, struct fsctl_args *uap, __unused register_t *retval)
+void
+munge_user64_stat64(struct stat64 *sbp, struct user64_stat64 *usbp)
{
- int error;
- boolean_t is64bit;
- struct nameidata nd;
- u_long nameiflags;
- u_long cmd = uap->cmd;
- u_int size;
-#define STK_PARAMS 128
- char stkbuf[STK_PARAMS];
- caddr_t data, memp;
- vfs_context_t ctx = vfs_context_current();
-
- size = IOCPARM_LEN(cmd);
- if (size > IOCPARM_MAX) return (EINVAL);
-
- is64bit = proc_is64bit(p);
+ bzero(usbp, sizeof(*usbp));
- memp = NULL;
- if (size > sizeof (stkbuf)) {
- if ((memp = (caddr_t)kalloc(size)) == 0) return ENOMEM;
- data = memp;
- } else {
- data = &stkbuf[0];
- };
-
- if (cmd & IOC_IN) {
- if (size) {
- error = copyin(uap->data, data, size);
- if (error) goto FSCtl_Exit;
- } else {
- if (is64bit) {
- *(user_addr_t *)data = uap->data;
- }
- else {
- *(uint32_t *)data = (uint32_t)uap->data;
- }
- };
- } else if ((cmd & IOC_OUT) && size) {
- /*
- * Zero the buffer so the user always
- * gets back something deterministic.
- */
- bzero(data, size);
- } else if (cmd & IOC_VOID) {
- if (is64bit) {
- *(user_addr_t *)data = uap->data;
- }
- else {
- *(uint32_t *)data = (uint32_t)uap->data;
- }
- }
+ usbp->st_dev = sbp->st_dev;
+ usbp->st_ino = sbp->st_ino;
+ usbp->st_mode = sbp->st_mode;
+ usbp->st_nlink = sbp->st_nlink;
+ usbp->st_uid = sbp->st_uid;
+ usbp->st_gid = sbp->st_gid;
+ usbp->st_rdev = sbp->st_rdev;
+#ifndef _POSIX_C_SOURCE
+ usbp->st_atimespec.tv_sec = sbp->st_atimespec.tv_sec;
+ usbp->st_atimespec.tv_nsec = sbp->st_atimespec.tv_nsec;
+ usbp->st_mtimespec.tv_sec = sbp->st_mtimespec.tv_sec;
+ usbp->st_mtimespec.tv_nsec = sbp->st_mtimespec.tv_nsec;
+ usbp->st_ctimespec.tv_sec = sbp->st_ctimespec.tv_sec;
+ usbp->st_ctimespec.tv_nsec = sbp->st_ctimespec.tv_nsec;
+ usbp->st_birthtimespec.tv_sec = sbp->st_birthtimespec.tv_sec;
+ usbp->st_birthtimespec.tv_nsec = sbp->st_birthtimespec.tv_nsec;
+#else
+ usbp->st_atime = sbp->st_atime;
+ usbp->st_atimensec = sbp->st_atimensec;
+ usbp->st_mtime = sbp->st_mtime;
+ usbp->st_mtimensec = sbp->st_mtimensec;
+ usbp->st_ctime = sbp->st_ctime;
+ usbp->st_ctimensec = sbp->st_ctimensec;
+ usbp->st_birthtime = sbp->st_birthtime;
+ usbp->st_birthtimensec = sbp->st_birthtimensec;
+#endif
+ usbp->st_size = sbp->st_size;
+ usbp->st_blocks = sbp->st_blocks;
+ usbp->st_blksize = sbp->st_blksize;
+ usbp->st_flags = sbp->st_flags;
+ usbp->st_gen = sbp->st_gen;
+ usbp->st_lspare = sbp->st_lspare;
+ usbp->st_qspare[0] = sbp->st_qspare[0];
+ usbp->st_qspare[1] = sbp->st_qspare[1];
+}
- /* Get the vnode for the file we are getting info on: */
- nameiflags = 0;
- if ((uap->options & FSOPT_NOFOLLOW) == 0) nameiflags |= FOLLOW;
- NDINIT(&nd, LOOKUP, nameiflags, UIO_USERSPACE, uap->path, ctx);
- if ((error = namei(&nd))) goto FSCtl_Exit;
+void
+munge_user32_stat64(struct stat64 *sbp, struct user32_stat64 *usbp)
+{
+ bzero(usbp, sizeof(*usbp));
-#if CONFIG_MACF
- error = mac_mount_check_fsctl(ctx, vnode_mount(nd.ni_vp), cmd);
- if (error) {
- vnode_put(nd.ni_vp);
- nameidone(&nd);
- goto FSCtl_Exit;
- }
+ usbp->st_dev = sbp->st_dev;
+ usbp->st_ino = sbp->st_ino;
+ usbp->st_mode = sbp->st_mode;
+ usbp->st_nlink = sbp->st_nlink;
+ usbp->st_uid = sbp->st_uid;
+ usbp->st_gid = sbp->st_gid;
+ usbp->st_rdev = sbp->st_rdev;
+#ifndef _POSIX_C_SOURCE
+ usbp->st_atimespec.tv_sec = (user32_time_t)sbp->st_atimespec.tv_sec;
+ usbp->st_atimespec.tv_nsec = (user32_long_t)sbp->st_atimespec.tv_nsec;
+ usbp->st_mtimespec.tv_sec = (user32_time_t)sbp->st_mtimespec.tv_sec;
+ usbp->st_mtimespec.tv_nsec = (user32_long_t)sbp->st_mtimespec.tv_nsec;
+ usbp->st_ctimespec.tv_sec = (user32_time_t)sbp->st_ctimespec.tv_sec;
+ usbp->st_ctimespec.tv_nsec = (user32_long_t)sbp->st_ctimespec.tv_nsec;
+ usbp->st_birthtimespec.tv_sec = (user32_time_t)sbp->st_birthtimespec.tv_sec;
+ usbp->st_birthtimespec.tv_nsec = (user32_long_t)sbp->st_birthtimespec.tv_nsec;
+#else
+ usbp->st_atime = sbp->st_atime;
+ usbp->st_atimensec = sbp->st_atimensec;
+ usbp->st_mtime = sbp->st_mtime;
+ usbp->st_mtimensec = sbp->st_mtimensec;
+ usbp->st_ctime = sbp->st_ctime;
+ usbp->st_ctimensec = sbp->st_ctimensec;
+ usbp->st_birthtime = sbp->st_birthtime;
+ usbp->st_birthtimensec = sbp->st_birthtimensec;
#endif
-
- /* Invoke the filesystem-specific code */
- error = VNOP_IOCTL(nd.ni_vp, IOCBASECMD(cmd), data, uap->options, ctx);
-
- vnode_put(nd.ni_vp);
- nameidone(&nd);
-
- /*
- * Copy any data to user, size was
- * already set and checked above.
- */
- if (error == 0 && (cmd & IOC_OUT) && size)
- error = copyout(data, uap->data, size);
-
-FSCtl_Exit:
- if (memp) kfree(memp, size);
-
- return error;
+ usbp->st_size = sbp->st_size;
+ usbp->st_blocks = sbp->st_blocks;
+ usbp->st_blksize = sbp->st_blksize;
+ usbp->st_flags = sbp->st_flags;
+ usbp->st_gen = sbp->st_gen;
+ usbp->st_lspare = sbp->st_lspare;
+ usbp->st_qspare[0] = sbp->st_qspare[0];
+ usbp->st_qspare[1] = sbp->st_qspare[1];
}
-/* end of fsctl system call */
/*
- * An in-kernel sync for power management to call.
+ * Purge buffer cache for simulating cold starts
*/
-__private_extern__ int
-sync_internal(void)
+static int
+vnode_purge_callback(struct vnode *vp, __unused void *cargs)
{
- int error;
-
- struct sync_args data;
+ ubc_msync(vp, (off_t)0, ubc_getsize(vp), NULL /* off_t *resid_off */, UBC_PUSHALL | UBC_INVALIDATE);
- int retval[2];
+ return VNODE_RETURNED;
+}
+static int
+vfs_purge_callback(mount_t mp, __unused void * arg)
+{
+ vnode_iterate(mp, VNODE_WAIT | VNODE_ITERATE_ALL, vnode_purge_callback, NULL);
- error = sync(current_proc(), &data, &retval[0]);
+ return VFS_RETURNED;
+}
+int
+vfs_purge(__unused struct proc *p, __unused struct vfs_purge_args *uap, __unused int32_t *retval)
+{
+ if (!kauth_cred_issuser(kauth_cred_get())) {
+ return EPERM;
+ }
- return (error);
-} /* end of sync_internal call */
+ vfs_iterate(0 /* flags */, vfs_purge_callback, NULL);
+ return 0;
+}
/*
- * Retrieve the data of an extended attribute.
+ * gets the vnode associated with the (unnamed) snapshot directory
+ * for a Filesystem. The snapshot directory vnode is returned with
+ * an iocount on it.
*/
int
-getxattr(proc_t p, struct getxattr_args *uap, user_ssize_t *retval)
+vnode_get_snapdir(vnode_t rvp, vnode_t *sdvpp, vfs_context_t ctx)
{
- vnode_t vp;
- struct nameidata nd;
- char attrname[XATTR_MAXNAMELEN+1];
- vfs_context_t ctx = vfs_context_current();
- uio_t auio = NULL;
- int spacetype = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
- size_t attrsize = 0;
- size_t namelen;
- u_long nameiflags;
- int error;
- char uio_buf[ UIO_SIZEOF(1) ];
+ return VFS_VGET_SNAPDIR(vnode_mount(rvp), sdvpp, ctx);
+}
+
+/*
+ * Get the snapshot vnode.
+ *
+ * If successful, the call returns with an iocount on *rvpp ,*sdvpp and
+ * needs nameidone() on ndp.
+ *
+ * If the snapshot vnode exists it is returned in ndp->ni_vp.
+ *
+ * If it returns with an error, *rvpp, *sdvpp are NULL and nameidone() is
+ * not needed.
+ */
+static int
+vnode_get_snapshot(int dirfd, vnode_t *rvpp, vnode_t *sdvpp,
+ user_addr_t name, struct nameidata *ndp, int32_t op,
+#if !CONFIG_TRIGGERS
+ __unused
+#endif
+ enum path_operation pathop,
+ vfs_context_t ctx)
+{
+ int error, i;
+ caddr_t name_buf;
+ size_t name_len;
+ struct vfs_attr vfa;
- if (uap->options & (XATTR_NOSECURITY | XATTR_NODEFAULT))
- return (EINVAL);
+ *sdvpp = NULLVP;
+ *rvpp = NULLVP;
- nameiflags = (uap->options & XATTR_NOFOLLOW) ? 0 : FOLLOW;
- NDINIT(&nd, LOOKUP, nameiflags, spacetype, uap->path, ctx);
- if ((error = namei(&nd))) {
- return (error);
+ error = vnode_getfromfd(ctx, dirfd, rvpp);
+ if (error) {
+ return error;
}
- vp = nd.ni_vp;
- nameidone(&nd);
- if ((error = copyinstr(uap->attrname, attrname, sizeof(attrname), &namelen) != 0)) {
+ if (!vnode_isvroot(*rvpp)) {
+ error = EINVAL;
goto out;
}
- if (xattr_protected(attrname)) {
- error = EPERM;
+
+ /* Make sure the filesystem supports snapshots */
+ VFSATTR_INIT(&vfa);
+ VFSATTR_WANTED(&vfa, f_capabilities);
+ if ((vfs_getattr(vnode_mount(*rvpp), &vfa, ctx) != 0) ||
+ !VFSATTR_IS_SUPPORTED(&vfa, f_capabilities) ||
+ !((vfa.f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] &
+ VOL_CAP_INT_SNAPSHOT)) ||
+ !((vfa.f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] &
+ VOL_CAP_INT_SNAPSHOT))) {
+ error = ENOTSUP;
goto out;
}
- if (uap->value && uap->size > 0) {
- auio = uio_createwithbuffer(1, uap->position, spacetype, UIO_READ,
- &uio_buf[0], sizeof(uio_buf));
- uio_addiov(auio, uap->value, uap->size);
+
+ error = vnode_get_snapdir(*rvpp, sdvpp, ctx);
+ if (error) {
+ goto out;
}
- error = vn_getxattr(vp, attrname, auio, &attrsize, uap->options, ctx);
-out:
- vnode_put(vp);
+ name_buf = zalloc_flags(ZV_NAMEI, Z_WAITOK);
+ error = copyinstr(name, name_buf, MAXPATHLEN, &name_len);
+ if (error) {
+ goto out1;
+ }
- if (auio) {
- *retval = uap->size - uio_resid(auio);
- } else {
- *retval = (user_ssize_t)attrsize;
+ /*
+ * Some sanity checks- name can't be empty, "." or ".." or have slashes.
+ * (the length returned by copyinstr includes the terminating NUL)
+ */
+ if ((name_len == 1) || (name_len == 2 && name_buf[0] == '.') ||
+ (name_len == 3 && name_buf[0] == '.' && name_buf[1] == '.')) {
+ error = EINVAL;
+ goto out1;
+ }
+ for (i = 0; i < (int)name_len && name_buf[i] != '/'; i++) {
+ ;
+ }
+ if (i < (int)name_len) {
+ error = EINVAL;
+ goto out1;
+ }
+
+#if CONFIG_MACF
+ if (op == CREATE) {
+ error = mac_mount_check_snapshot_create(ctx, vnode_mount(*rvpp),
+ name_buf);
+ } else if (op == DELETE) {
+ error = mac_mount_check_snapshot_delete(ctx, vnode_mount(*rvpp),
+ name_buf);
+ }
+ if (error) {
+ goto out1;
}
+#endif
+
+ /* Check if the snapshot already exists ... */
+ NDINIT(ndp, op, pathop, USEDVP | NOCACHE | AUDITVNPATH1,
+ UIO_SYSSPACE, CAST_USER_ADDR_T(name_buf), ctx);
+ ndp->ni_dvp = *sdvpp;
- return (error);
+ error = namei(ndp);
+out1:
+ zfree(ZV_NAMEI, name_buf);
+out:
+ if (error) {
+ if (*sdvpp) {
+ vnode_put(*sdvpp);
+ *sdvpp = NULLVP;
+ }
+ if (*rvpp) {
+ vnode_put(*rvpp);
+ *rvpp = NULLVP;
+ }
+ }
+ return error;
}
/*
- * Retrieve the data of an extended attribute.
+ * create a filesystem snapshot (for supporting filesystems)
+ *
+ * A much simplified version of openat(dirfd, name, O_CREAT | O_EXCL)
+ * We get to the (unnamed) snapshot directory vnode and create the vnode
+ * for the snapshot in it.
+ *
+ * Restrictions:
+ *
+ * a) Passed in name for snapshot cannot have slashes.
+ * b) name can't be "." or ".."
+ *
+ * Since this requires superuser privileges, vnode_authorize calls are not
+ * made.
*/
-int
-fgetxattr(proc_t p, struct fgetxattr_args *uap, user_ssize_t *retval)
+static int __attribute__((noinline))
+snapshot_create(int dirfd, user_addr_t name, __unused uint32_t flags,
+ vfs_context_t ctx)
{
- vnode_t vp;
- char attrname[XATTR_MAXNAMELEN+1];
- uio_t auio = NULL;
- int spacetype = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
- size_t attrsize = 0;
- size_t namelen;
+ vnode_t rvp, snapdvp;
int error;
- char uio_buf[ UIO_SIZEOF(1) ];
+ struct nameidata *ndp;
- if (uap->options & (XATTR_NOFOLLOW | XATTR_NOSECURITY | XATTR_NODEFAULT))
- return (EINVAL);
+ ndp = kheap_alloc(KHEAP_TEMP, sizeof(*ndp), Z_WAITOK);
- if ( (error = file_vnode(uap->fd, &vp)) ) {
- return (error);
- }
- if ( (error = vnode_getwithref(vp)) ) {
- file_drop(uap->fd);
- return(error);
- }
- if ((error = copyinstr(uap->attrname, attrname, sizeof(attrname), &namelen) != 0)) {
- goto out;
- }
- if (xattr_protected(attrname)) {
- error = EPERM;
+ error = vnode_get_snapshot(dirfd, &rvp, &snapdvp, name, ndp, CREATE,
+ OP_LINK, ctx);
+ if (error) {
goto out;
}
- if (uap->value && uap->size > 0) {
- auio = uio_createwithbuffer(1, uap->position, spacetype, UIO_READ,
- &uio_buf[0], sizeof(uio_buf));
- uio_addiov(auio, uap->value, uap->size);
+
+ if (ndp->ni_vp) {
+ vnode_put(ndp->ni_vp);
+ error = EEXIST;
+ } else {
+ struct vnode_attr *vap;
+ vnode_t vp = NULLVP;
+
+ vap = kheap_alloc(KHEAP_TEMP, sizeof(*vap), Z_WAITOK);
+
+ VATTR_INIT(vap);
+ VATTR_SET(vap, va_type, VREG);
+ VATTR_SET(vap, va_mode, 0);
+
+ error = vn_create(snapdvp, &vp, ndp, vap,
+ VN_CREATE_NOAUTH | VN_CREATE_NOINHERIT, 0, NULL, ctx);
+ if (!error && vp) {
+ vnode_put(vp);
+ }
+
+ kheap_free(KHEAP_TEMP, vap, sizeof(*vap));
}
- error = vn_getxattr(vp, attrname, auio, &attrsize, uap->options, vfs_context_current());
+ nameidone(ndp);
+ vnode_put(snapdvp);
+ vnode_put(rvp);
out:
- (void)vnode_put(vp);
- file_drop(uap->fd);
+ kheap_free(KHEAP_TEMP, ndp, sizeof(*ndp));
- if (auio) {
- *retval = uap->size - uio_resid(auio);
- } else {
- *retval = (user_ssize_t)attrsize;
- }
- return (error);
+ return error;
}
/*
- * Set the data of an extended attribute.
+ * Delete a Filesystem snapshot
+ *
+ * get the vnode for the unnamed snapshot directory and the snapshot and
+ * delete the snapshot.
*/
-int
-setxattr(proc_t p, struct setxattr_args *uap, int *retval)
+static int __attribute__((noinline))
+snapshot_delete(int dirfd, user_addr_t name, __unused uint32_t flags,
+ vfs_context_t ctx)
{
- vnode_t vp;
- struct nameidata nd;
- char attrname[XATTR_MAXNAMELEN+1];
- vfs_context_t ctx = vfs_context_current();
- uio_t auio = NULL;
- int spacetype = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
- size_t namelen;
- u_long nameiflags;
+ vnode_t rvp, snapdvp;
int error;
- char uio_buf[ UIO_SIZEOF(1) ];
+ struct nameidata *ndp;
- if (uap->options & (XATTR_NOSECURITY | XATTR_NODEFAULT))
- return (EINVAL);
+ ndp = kheap_alloc(KHEAP_TEMP, sizeof(*ndp), Z_WAITOK);
- if ((error = copyinstr(uap->attrname, attrname, sizeof(attrname), &namelen) != 0)) {
- return (error);
- }
- if (xattr_protected(attrname))
- return(EPERM);
- if (uap->size != 0 && uap->value == 0) {
- return (EINVAL);
+ error = vnode_get_snapshot(dirfd, &rvp, &snapdvp, name, ndp, DELETE,
+ OP_UNLINK, ctx);
+ if (error) {
+ goto out;
}
- nameiflags = (uap->options & XATTR_NOFOLLOW) ? 0 : FOLLOW;
- NDINIT(&nd, LOOKUP, nameiflags, spacetype, uap->path, ctx);
- if ((error = namei(&nd))) {
- return (error);
- }
- vp = nd.ni_vp;
- nameidone(&nd);
+ error = VNOP_REMOVE(snapdvp, ndp->ni_vp, &ndp->ni_cnd,
+ VNODE_REMOVE_SKIP_NAMESPACE_EVENT, ctx);
- auio = uio_createwithbuffer(1, uap->position, spacetype, UIO_WRITE,
- &uio_buf[0], sizeof(uio_buf));
- uio_addiov(auio, uap->value, uap->size);
+ vnode_put(ndp->ni_vp);
+ nameidone(ndp);
+ vnode_put(snapdvp);
+ vnode_put(rvp);
+out:
+ kheap_free(KHEAP_TEMP, ndp, sizeof(*ndp));
- error = vn_setxattr(vp, attrname, auio, uap->options, ctx);
-#if CONFIG_FSE
- if (error == 0) {
- add_fsevent(FSE_XATTR_MODIFIED, ctx,
- FSE_ARG_VNODE, vp,
- FSE_ARG_DONE);
- }
-#endif
- vnode_put(vp);
- *retval = 0;
- return (error);
+ return error;
}
/*
- * Set the data of an extended attribute.
+ * Revert a filesystem to a snapshot
+ *
+ * Marks the filesystem to revert to the given snapshot on next mount.
*/
-int
-fsetxattr(proc_t p, struct fsetxattr_args *uap, int *retval)
+static int __attribute__((noinline))
+snapshot_revert(int dirfd, user_addr_t name, __unused uint32_t flags,
+ vfs_context_t ctx)
{
- vnode_t vp;
- char attrname[XATTR_MAXNAMELEN+1];
- uio_t auio = NULL;
- int spacetype = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
- size_t namelen;
int error;
- char uio_buf[ UIO_SIZEOF(1) ];
- vfs_context_t ctx = vfs_context_current();
-
- if (uap->options & (XATTR_NOFOLLOW | XATTR_NOSECURITY | XATTR_NODEFAULT))
- return (EINVAL);
+ vnode_t rvp;
+ mount_t mp;
+ struct fs_snapshot_revert_args revert_data;
+ struct componentname cnp;
+ caddr_t name_buf;
+ size_t name_len;
- if ((error = copyinstr(uap->attrname, attrname, sizeof(attrname), &namelen) != 0)) {
- return (error);
+ error = vnode_getfromfd(ctx, dirfd, &rvp);
+ if (error) {
+ return error;
}
- if (xattr_protected(attrname))
- return(EPERM);
- if (uap->size != 0 && uap->value == 0) {
- return (EINVAL);
+ mp = vnode_mount(rvp);
+
+ name_buf = zalloc_flags(ZV_NAMEI, Z_WAITOK);
+ error = copyinstr(name, name_buf, MAXPATHLEN, &name_len);
+ if (error) {
+ zfree(ZV_NAMEI, name_buf);
+ vnode_put(rvp);
+ return error;
}
- if ( (error = file_vnode(uap->fd, &vp)) ) {
- return (error);
+
+#if CONFIG_MACF
+ error = mac_mount_check_snapshot_revert(ctx, mp, name_buf);
+ if (error) {
+ zfree(ZV_NAMEI, name_buf);
+ vnode_put(rvp);
+ return error;
}
- if ( (error = vnode_getwithref(vp)) ) {
- file_drop(uap->fd);
- return(error);
+#endif
+
+ /*
+ * Grab mount_iterref so that we can release the vnode,
+ * since VFSIOC_REVERT_SNAPSHOT could conceivably cause a sync.
+ */
+ error = mount_iterref(mp, 0);
+ vnode_put(rvp);
+ if (error) {
+ zfree(ZV_NAMEI, name_buf);
+ return error;
}
- auio = uio_createwithbuffer(1, uap->position, spacetype, UIO_WRITE,
- &uio_buf[0], sizeof(uio_buf));
- uio_addiov(auio, uap->value, uap->size);
- error = vn_setxattr(vp, attrname, auio, uap->options, vfs_context_current());
-#if CONFIG_FSE
- if (error == 0) {
- add_fsevent(FSE_XATTR_MODIFIED, ctx,
- FSE_ARG_VNODE, vp,
- FSE_ARG_DONE);
+ memset(&cnp, 0, sizeof(cnp));
+ cnp.cn_pnbuf = (char *)name_buf;
+ cnp.cn_nameiop = LOOKUP;
+ cnp.cn_flags = ISLASTCN | HASBUF;
+ cnp.cn_pnlen = MAXPATHLEN;
+ cnp.cn_nameptr = cnp.cn_pnbuf;
+ cnp.cn_namelen = (int)name_len;
+ revert_data.sr_cnp = &cnp;
+
+ error = VFS_IOCTL(mp, VFSIOC_REVERT_SNAPSHOT, (caddr_t)&revert_data, 0, ctx);
+ mount_iterdrop(mp);
+ zfree(ZV_NAMEI, name_buf);
+
+ if (error) {
+ /* If there was any error, try again using VNOP_IOCTL */
+
+ vnode_t snapdvp;
+ struct nameidata namend;
+
+ error = vnode_get_snapshot(dirfd, &rvp, &snapdvp, name, &namend, LOOKUP,
+ OP_LOOKUP, ctx);
+ if (error) {
+ return error;
+ }
+
+
+ error = VNOP_IOCTL(namend.ni_vp, APFSIOC_REVERT_TO_SNAPSHOT, (caddr_t) NULL,
+ 0, ctx);
+
+ vnode_put(namend.ni_vp);
+ nameidone(&namend);
+ vnode_put(snapdvp);
+ vnode_put(rvp);
}
-#endif
- vnode_put(vp);
- file_drop(uap->fd);
- *retval = 0;
- return (error);
+
+ return error;
}
/*
- * Remove an extended attribute.
+ * rename a Filesystem snapshot
+ *
+ * get the vnode for the unnamed snapshot directory and the snapshot and
+ * rename the snapshot. This is a very specialised (and simple) case of
+ * rename(2) (which has to deal with a lot more complications). It differs
+ * slightly from rename(2) in that EEXIST is returned if the new name exists.
*/
-#warning "code duplication"
-int
-removexattr(proc_t p, struct removexattr_args *uap, int *retval)
+static int __attribute__((noinline))
+snapshot_rename(int dirfd, user_addr_t old, user_addr_t new,
+ __unused uint32_t flags, vfs_context_t ctx)
{
- vnode_t vp;
- struct nameidata nd;
- char attrname[XATTR_MAXNAMELEN+1];
- int spacetype = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
- vfs_context_t ctx = vfs_context_current();
- size_t namelen;
- u_long nameiflags;
- int error;
+ vnode_t rvp, snapdvp;
+ int error, i;
+ caddr_t newname_buf;
+ size_t name_len;
+ vnode_t fvp;
+ struct nameidata *fromnd, *tond;
+ /* carving out a chunk for structs that are too big to be on stack. */
+ struct {
+ struct nameidata from_node;
+ struct nameidata to_node;
+ } * __rename_data;
+
+ __rename_data = kheap_alloc(KHEAP_TEMP, sizeof(*__rename_data), Z_WAITOK);
+ fromnd = &__rename_data->from_node;
+ tond = &__rename_data->to_node;
+
+ error = vnode_get_snapshot(dirfd, &rvp, &snapdvp, old, fromnd, DELETE,
+ OP_UNLINK, ctx);
+ if (error) {
+ goto out;
+ }
+ fvp = fromnd->ni_vp;
- if (uap->options & (XATTR_NOSECURITY | XATTR_NODEFAULT))
- return (EINVAL);
+ newname_buf = zalloc_flags(ZV_NAMEI, Z_WAITOK);
+ error = copyinstr(new, newname_buf, MAXPATHLEN, &name_len);
+ if (error) {
+ goto out1;
+ }
- error = copyinstr(uap->attrname, attrname, sizeof(attrname), &namelen);
- if (error != 0) {
- return (error);
+ /*
+ * Some sanity checks- new name can't be empty, "." or ".." or have
+ * slashes.
+ * (the length returned by copyinstr includes the terminating NUL)
+ *
+ * The FS rename VNOP is suppossed to handle this but we'll pick it
+ * off here itself.
+ */
+ if ((name_len == 1) || (name_len == 2 && newname_buf[0] == '.') ||
+ (name_len == 3 && newname_buf[0] == '.' && newname_buf[1] == '.')) {
+ error = EINVAL;
+ goto out1;
}
- if (xattr_protected(attrname))
- return(EPERM);
- nameiflags = (uap->options & XATTR_NOFOLLOW) ? 0 : FOLLOW;
- NDINIT(&nd, LOOKUP, nameiflags, spacetype, uap->path, ctx);
- if ((error = namei(&nd))) {
- return (error);
+ for (i = 0; i < (int)name_len && newname_buf[i] != '/'; i++) {
+ ;
+ }
+ if (i < (int)name_len) {
+ error = EINVAL;
+ goto out1;
}
- vp = nd.ni_vp;
- nameidone(&nd);
- error = vn_removexattr(vp, attrname, uap->options, ctx);
-#if CONFIG_FSE
- if (error == 0) {
- add_fsevent(FSE_XATTR_REMOVED, ctx,
- FSE_ARG_VNODE, vp,
- FSE_ARG_DONE);
+#if CONFIG_MACF
+ error = mac_mount_check_snapshot_create(ctx, vnode_mount(rvp),
+ newname_buf);
+ if (error) {
+ goto out1;
}
#endif
- vnode_put(vp);
- *retval = 0;
- return (error);
+
+ NDINIT(tond, RENAME, OP_RENAME, USEDVP | NOCACHE | AUDITVNPATH2,
+ UIO_SYSSPACE, CAST_USER_ADDR_T(newname_buf), ctx);
+ tond->ni_dvp = snapdvp;
+
+ error = namei(tond);
+ if (error) {
+ goto out2;
+ } else if (tond->ni_vp) {
+ /*
+ * snapshot rename behaves differently than rename(2) - if the
+ * new name exists, EEXIST is returned.
+ */
+ vnode_put(tond->ni_vp);
+ error = EEXIST;
+ goto out2;
+ }
+
+ error = VNOP_RENAME(snapdvp, fvp, &fromnd->ni_cnd, snapdvp, NULLVP,
+ &tond->ni_cnd, ctx);
+
+out2:
+ nameidone(tond);
+out1:
+ zfree(ZV_NAMEI, newname_buf);
+ vnode_put(fvp);
+ vnode_put(snapdvp);
+ vnode_put(rvp);
+ nameidone(fromnd);
+out:
+ kheap_free(KHEAP_TEMP, __rename_data, sizeof(*__rename_data));
+ return error;
}
/*
- * Remove an extended attribute.
+ * Mount a Filesystem snapshot
+ *
+ * get the vnode for the unnamed snapshot directory and the snapshot and
+ * mount the snapshot.
*/
-#warning "code duplication"
-int
-fremovexattr(__unused proc_t p, struct fremovexattr_args *uap, int *retval)
+static int __attribute__((noinline))
+snapshot_mount(int dirfd, user_addr_t name, user_addr_t directory,
+ __unused user_addr_t mnt_data, __unused uint32_t flags, vfs_context_t ctx)
{
- vnode_t vp;
- char attrname[XATTR_MAXNAMELEN+1];
- size_t namelen;
+ mount_t mp;
+ vnode_t rvp, snapdvp, snapvp, vp, pvp;
+ struct fs_snapshot_mount_args smnt_data;
int error;
- vfs_context_t ctx = vfs_context_current();
-
- if (uap->options & (XATTR_NOFOLLOW | XATTR_NOSECURITY | XATTR_NODEFAULT))
- return (EINVAL);
+ struct nameidata *snapndp, *dirndp;
+ /* carving out a chunk for structs that are too big to be on stack. */
+ struct {
+ struct nameidata snapnd;
+ struct nameidata dirnd;
+ } * __snapshot_mount_data;
+
+ __snapshot_mount_data = kheap_alloc(KHEAP_TEMP,
+ sizeof(*__snapshot_mount_data), Z_WAITOK);
+ snapndp = &__snapshot_mount_data->snapnd;
+ dirndp = &__snapshot_mount_data->dirnd;
+
+ error = vnode_get_snapshot(dirfd, &rvp, &snapdvp, name, snapndp, LOOKUP,
+ OP_LOOKUP, ctx);
+ if (error) {
+ goto out;
+ }
- error = copyinstr(uap->attrname, attrname, sizeof(attrname), &namelen);
- if (error != 0) {
- return (error);
+ snapvp = snapndp->ni_vp;
+ if (!vnode_mount(rvp) || (vnode_mount(rvp) == dead_mountp)) {
+ error = EIO;
+ goto out1;
}
- if (xattr_protected(attrname))
- return(EPERM);
- if ( (error = file_vnode(uap->fd, &vp)) ) {
- return (error);
+
+ /* Get the vnode to be covered */
+ NDINIT(dirndp, LOOKUP, OP_MOUNT, FOLLOW | AUDITVNPATH1 | WANTPARENT,
+ UIO_USERSPACE, directory, ctx);
+ error = namei(dirndp);
+ if (error) {
+ goto out1;
}
- if ( (error = vnode_getwithref(vp)) ) {
- file_drop(uap->fd);
- return(error);
+
+ vp = dirndp->ni_vp;
+ pvp = dirndp->ni_dvp;
+ mp = vnode_mount(rvp);
+
+ if ((vp->v_flag & VROOT) && (vp->v_mount->mnt_flag & MNT_ROOTFS)) {
+ error = EINVAL;
+ goto out2;
}
- error = vn_removexattr(vp, attrname, uap->options, vfs_context_current());
-#if CONFIG_FSE
- if (error == 0) {
- add_fsevent(FSE_XATTR_REMOVED, ctx,
- FSE_ARG_VNODE, vp,
- FSE_ARG_DONE);
+#if CONFIG_MACF
+ error = mac_mount_check_snapshot_mount(ctx, rvp, vp, &dirndp->ni_cnd, snapndp->ni_cnd.cn_nameptr,
+ mp->mnt_vfsstat.f_fstypename);
+ if (error) {
+ goto out2;
}
#endif
+
+ smnt_data.sm_mp = mp;
+ smnt_data.sm_cnp = &snapndp->ni_cnd;
+ error = mount_common(mp->mnt_vfsstat.f_fstypename, pvp, vp,
+ &dirndp->ni_cnd, CAST_USER_ADDR_T(&smnt_data), flags & MNT_DONTBROWSE,
+ KERNEL_MOUNT_SNAPSHOT, NULL, FALSE, ctx);
+
+out2:
vnode_put(vp);
- file_drop(uap->fd);
- *retval = 0;
- return (error);
+ vnode_put(pvp);
+ nameidone(dirndp);
+out1:
+ vnode_put(snapvp);
+ vnode_put(snapdvp);
+ vnode_put(rvp);
+ nameidone(snapndp);
+out:
+ kheap_free(KHEAP_TEMP, __snapshot_mount_data,
+ sizeof(*__snapshot_mount_data));
+ return error;
}
/*
- * Retrieve the list of extended attribute names.
+ * Root from a snapshot of the filesystem
+ *
+ * Marks the filesystem to root from the given snapshot on next boot.
*/
-#warning "code duplication"
-int
-listxattr(proc_t p, struct listxattr_args *uap, user_ssize_t *retval)
+static int __attribute__((noinline))
+snapshot_root(int dirfd, user_addr_t name, __unused uint32_t flags,
+ vfs_context_t ctx)
{
- vnode_t vp;
- struct nameidata nd;
- vfs_context_t ctx = vfs_context_current();
- uio_t auio = NULL;
- int spacetype = IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
- size_t attrsize = 0;
- u_long nameiflags;
int error;
- char uio_buf[ UIO_SIZEOF(1) ];
-
- if (uap->options & (XATTR_NOSECURITY | XATTR_NODEFAULT))
- return (EINVAL);
+ vnode_t rvp;
+ mount_t mp;
+ struct fs_snapshot_root_args root_data;
+ struct componentname cnp;
+ caddr_t name_buf;
+ size_t name_len;
- nameiflags = ((uap->options & XATTR_NOFOLLOW) ? 0 : FOLLOW) | NOTRIGGER;
- NDINIT(&nd, LOOKUP, nameiflags, spacetype, uap->path, ctx);
- if ((error = namei(&nd))) {
- return (error);
+ error = vnode_getfromfd(ctx, dirfd, &rvp);
+ if (error) {
+ return error;
}
- vp = nd.ni_vp;
- nameidone(&nd);
- if (uap->namebuf != 0 && uap->bufsize > 0) {
- // LP64todo - fix this!
- auio = uio_createwithbuffer(1, 0, spacetype,
- UIO_READ, &uio_buf[0], sizeof(uio_buf));
- uio_addiov(auio, uap->namebuf, uap->bufsize);
+ mp = vnode_mount(rvp);
+
+ name_buf = zalloc_flags(ZV_NAMEI, Z_WAITOK);
+ error = copyinstr(name, name_buf, MAXPATHLEN, &name_len);
+ if (error) {
+ zfree(ZV_NAMEI, name_buf);
+ vnode_put(rvp);
+ return error;
}
- error = vn_listxattr(vp, auio, &attrsize, uap->options, ctx);
+ // XXX MAC checks ?
- vnode_put(vp);
- if (auio) {
- *retval = (user_ssize_t)uap->bufsize - uio_resid(auio);
- } else {
- *retval = (user_ssize_t)attrsize;
+ /*
+ * Grab mount_iterref so that we can release the vnode,
+ * since VFSIOC_ROOT_SNAPSHOT could conceivably cause a sync.
+ */
+ error = mount_iterref(mp, 0);
+ vnode_put(rvp);
+ if (error) {
+ zfree(ZV_NAMEI, name_buf);
+ return error;
}
- return (error);
+
+ memset(&cnp, 0, sizeof(cnp));
+ cnp.cn_pnbuf = (char *)name_buf;
+ cnp.cn_nameiop = LOOKUP;
+ cnp.cn_flags = ISLASTCN | HASBUF;
+ cnp.cn_pnlen = MAXPATHLEN;
+ cnp.cn_nameptr = cnp.cn_pnbuf;
+ cnp.cn_namelen = (int)name_len;
+ root_data.sr_cnp = &cnp;
+
+ error = VFS_IOCTL(mp, VFSIOC_ROOT_SNAPSHOT, (caddr_t)&root_data, 0, ctx);
+
+ mount_iterdrop(mp);
+ zfree(ZV_NAMEI, name_buf);
+
+ return error;
}
/*
- * Retrieve the list of extended attribute names.
+ * FS snapshot operations dispatcher
*/
-#warning "code duplication"
int
-flistxattr(proc_t p, struct flistxattr_args *uap, user_ssize_t *retval)
+fs_snapshot(__unused proc_t p, struct fs_snapshot_args *uap,
+ __unused int32_t *retval)
{
- vnode_t vp;
- uio_t auio = NULL;
- int spacetype = proc_is64bit(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
- size_t attrsize = 0;
int error;
- char uio_buf[ UIO_SIZEOF(1) ];
-
- if (uap->options & (XATTR_NOFOLLOW | XATTR_NOSECURITY | XATTR_NODEFAULT))
- return (EINVAL);
-
- if ( (error = file_vnode(uap->fd, &vp)) ) {
- return (error);
- }
- if ( (error = vnode_getwithref(vp)) ) {
- file_drop(uap->fd);
- return(error);
- }
- if (uap->namebuf != 0 && uap->bufsize > 0) {
- // LP64todo - fix this!
- auio = uio_createwithbuffer(1, 0, spacetype,
- UIO_READ, &uio_buf[0], sizeof(uio_buf));
- uio_addiov(auio, uap->namebuf, uap->bufsize);
- }
+ vfs_context_t ctx = vfs_context_current();
- error = vn_listxattr(vp, auio, &attrsize, uap->options, vfs_context_current());
+ AUDIT_ARG(fd, uap->dirfd);
+ AUDIT_ARG(value32, uap->op);
- vnode_put(vp);
- file_drop(uap->fd);
- if (auio) {
- *retval = (user_ssize_t)uap->bufsize - uio_resid(auio);
- } else {
- *retval = (user_ssize_t)attrsize;
+ error = priv_check_cred(vfs_context_ucred(ctx), PRIV_VFS_SNAPSHOT, 0);
+ if (error) {
+ return error;
}
- return (error);
-}
-
-/*
- * Common routine to handle various flavors of statfs data heading out
- * to user space.
- *
- * Returns: 0 Success
- * EFAULT
- */
-static int
-munge_statfs(struct mount *mp, struct vfsstatfs *sfsp,
- user_addr_t bufp, int *sizep, boolean_t is_64_bit,
- boolean_t partial_copy)
-{
- int error;
- int my_size, copy_size;
- if (is_64_bit) {
- struct user_statfs sfs;
- my_size = copy_size = sizeof(sfs);
- bzero(&sfs, my_size);
- sfs.f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
- sfs.f_type = mp->mnt_vtable->vfc_typenum;
- sfs.f_reserved1 = (short)sfsp->f_fssubtype;
- sfs.f_bsize = (user_long_t)sfsp->f_bsize;
- sfs.f_iosize = (user_long_t)sfsp->f_iosize;
- sfs.f_blocks = (user_long_t)sfsp->f_blocks;
- sfs.f_bfree = (user_long_t)sfsp->f_bfree;
- sfs.f_bavail = (user_long_t)sfsp->f_bavail;
- sfs.f_files = (user_long_t)sfsp->f_files;
- sfs.f_ffree = (user_long_t)sfsp->f_ffree;
- sfs.f_fsid = sfsp->f_fsid;
- sfs.f_owner = sfsp->f_owner;
- strlcpy(&sfs.f_fstypename[0], &sfsp->f_fstypename[0], MFSNAMELEN);
- strlcpy(&sfs.f_mntonname[0], &sfsp->f_mntonname[0], MNAMELEN);
- strlcpy(&sfs.f_mntfromname[0], &sfsp->f_mntfromname[0], MNAMELEN);
+ /*
+ * Enforce user authorization for snapshot modification operations,
+ * or if trying to root from snapshot.
+ */
+ if (uap->op != SNAPSHOT_OP_MOUNT) {
+ vnode_t dvp = NULLVP;
+ vnode_t devvp = NULLVP;
+ mount_t mp;
- if (partial_copy) {
- copy_size -= (sizeof(sfs.f_reserved3) + sizeof(sfs.f_reserved4));
+ error = vnode_getfromfd(ctx, uap->dirfd, &dvp);
+ if (error) {
+ return error;
}
- error = copyout((caddr_t)&sfs, bufp, copy_size);
- }
- else {
- struct statfs sfs;
- my_size = copy_size = sizeof(sfs);
- bzero(&sfs, my_size);
-
- sfs.f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
- sfs.f_type = mp->mnt_vtable->vfc_typenum;
- sfs.f_reserved1 = (short)sfsp->f_fssubtype;
-
- /*
- * It's possible for there to be more than 2^^31 blocks in the filesystem, so we
- * have to fudge the numbers here in that case. We inflate the blocksize in order
- * to reflect the filesystem size as best we can.
- */
- if ((sfsp->f_blocks > LONG_MAX)
- /* Hack for 4061702 . I think the real fix is for Carbon to
- * look for some volume capability and not depend on hidden
- * semantics agreed between a FS and carbon.
- * f_blocks, f_bfree, and f_bavail set to -1 is the trigger
- * for Carbon to set bNoVolumeSizes volume attribute.
- * Without this the webdavfs files cannot be copied onto
- * disk as they look huge. This change should not affect
- * XSAN as they should not setting these to -1..
- */
- && (sfsp->f_blocks != 0xffffffffffffffffULL)
- && (sfsp->f_bfree != 0xffffffffffffffffULL)
- && (sfsp->f_bavail != 0xffffffffffffffffULL)) {
- int shift;
+ mp = vnode_mount(dvp);
+ devvp = mp->mnt_devvp;
- /*
- * Work out how far we have to shift the block count down to make it fit.
- * Note that it's possible to have to shift so far that the resulting
- * blocksize would be unreportably large. At that point, we will clip
- * any values that don't fit.
- *
- * For safety's sake, we also ensure that f_iosize is never reported as
- * being smaller than f_bsize.
- */
- for (shift = 0; shift < 32; shift++) {
- if ((sfsp->f_blocks >> shift) <= LONG_MAX)
- break;
- if ((sfsp->f_bsize << (shift + 1)) > LONG_MAX)
- break;
+ /* get an iocount on devvp */
+ if (devvp == NULLVP) {
+ error = vnode_lookup(mp->mnt_vfsstat.f_mntfromname, 0, &devvp, ctx);
+ /* for mounts which arent block devices */
+ if (error == ENOENT) {
+ error = ENXIO;
}
-#define __SHIFT_OR_CLIP(x, s) ((((x) >> (s)) > LONG_MAX) ? LONG_MAX : ((x) >> (s)))
- sfs.f_blocks = (long)__SHIFT_OR_CLIP(sfsp->f_blocks, shift);
- sfs.f_bfree = (long)__SHIFT_OR_CLIP(sfsp->f_bfree, shift);
- sfs.f_bavail = (long)__SHIFT_OR_CLIP(sfsp->f_bavail, shift);
-#undef __SHIFT_OR_CLIP
- sfs.f_bsize = (long)(sfsp->f_bsize << shift);
- sfs.f_iosize = lmax(sfsp->f_iosize, sfsp->f_bsize);
} else {
- /* filesystem is small enough to be reported honestly */
- sfs.f_bsize = (long)sfsp->f_bsize;
- sfs.f_iosize = (long)sfsp->f_iosize;
- sfs.f_blocks = (long)sfsp->f_blocks;
- sfs.f_bfree = (long)sfsp->f_bfree;
- sfs.f_bavail = (long)sfsp->f_bavail;
- }
- sfs.f_files = (long)sfsp->f_files;
- sfs.f_ffree = (long)sfsp->f_ffree;
- sfs.f_fsid = sfsp->f_fsid;
- sfs.f_owner = sfsp->f_owner;
- strlcpy(&sfs.f_fstypename[0], &sfsp->f_fstypename[0], MFSNAMELEN);
- strlcpy(&sfs.f_mntonname[0], &sfsp->f_mntonname[0], MNAMELEN);
- strlcpy(&sfs.f_mntfromname[0], &sfsp->f_mntfromname[0], MNAMELEN);
+ error = vnode_getwithref(devvp);
+ }
- if (partial_copy) {
- copy_size -= (sizeof(sfs.f_reserved3) + sizeof(sfs.f_reserved4));
+ if (error) {
+ vnode_put(dvp);
+ return error;
}
- error = copyout((caddr_t)&sfs, bufp, copy_size);
- }
-
- if (sizep != NULL) {
- *sizep = my_size;
- }
- return(error);
-}
-/*
- * copy stat structure into user_stat structure.
- */
-void munge_stat(struct stat *sbp, struct user_stat *usbp)
-{
- bzero(usbp, sizeof(struct user_stat));
+ if ((vfs_context_issuser(ctx) == 0) &&
+ (vnode_authorize(devvp, NULL, KAUTH_VNODE_WRITE_DATA, ctx) != 0)) {
+ error = EPERM;
+ }
+ vnode_put(dvp);
+ vnode_put(devvp);
- usbp->st_dev = sbp->st_dev;
- usbp->st_ino = sbp->st_ino;
- usbp->st_mode = sbp->st_mode;
- usbp->st_nlink = sbp->st_nlink;
- usbp->st_uid = sbp->st_uid;
- usbp->st_gid = sbp->st_gid;
- usbp->st_rdev = sbp->st_rdev;
-#ifndef _POSIX_C_SOURCE
- usbp->st_atimespec.tv_sec = sbp->st_atimespec.tv_sec;
- usbp->st_atimespec.tv_nsec = sbp->st_atimespec.tv_nsec;
- usbp->st_mtimespec.tv_sec = sbp->st_mtimespec.tv_sec;
- usbp->st_mtimespec.tv_nsec = sbp->st_mtimespec.tv_nsec;
- usbp->st_ctimespec.tv_sec = sbp->st_ctimespec.tv_sec;
- usbp->st_ctimespec.tv_nsec = sbp->st_ctimespec.tv_nsec;
-#else
- usbp->st_atime = sbp->st_atime;
- usbp->st_atimensec = sbp->st_atimensec;
- usbp->st_mtime = sbp->st_mtime;
- usbp->st_mtimensec = sbp->st_mtimensec;
- usbp->st_ctime = sbp->st_ctime;
- usbp->st_ctimensec = sbp->st_ctimensec;
-#endif
- usbp->st_size = sbp->st_size;
- usbp->st_blocks = sbp->st_blocks;
- usbp->st_blksize = sbp->st_blksize;
- usbp->st_flags = sbp->st_flags;
- usbp->st_gen = sbp->st_gen;
- usbp->st_lspare = sbp->st_lspare;
- usbp->st_qspare[0] = sbp->st_qspare[0];
- usbp->st_qspare[1] = sbp->st_qspare[1];
-}
+ if (error) {
+ return error;
+ }
+ }
-/*
- * copy stat64 structure into user_stat64 structure.
- */
-void munge_stat64(struct stat64 *sbp, struct user_stat64 *usbp)
-{
- bzero(usbp, sizeof(struct user_stat));
+ switch (uap->op) {
+ case SNAPSHOT_OP_CREATE:
+ error = snapshot_create(uap->dirfd, uap->name1, uap->flags, ctx);
+ break;
+ case SNAPSHOT_OP_DELETE:
+ error = snapshot_delete(uap->dirfd, uap->name1, uap->flags, ctx);
+ break;
+ case SNAPSHOT_OP_RENAME:
+ error = snapshot_rename(uap->dirfd, uap->name1, uap->name2,
+ uap->flags, ctx);
+ break;
+ case SNAPSHOT_OP_MOUNT:
+ error = snapshot_mount(uap->dirfd, uap->name1, uap->name2,
+ uap->data, uap->flags, ctx);
+ break;
+ case SNAPSHOT_OP_REVERT:
+ error = snapshot_revert(uap->dirfd, uap->name1, uap->flags, ctx);
+ break;
+#if CONFIG_MNT_ROOTSNAP
+ case SNAPSHOT_OP_ROOT:
+ error = snapshot_root(uap->dirfd, uap->name1, uap->flags, ctx);
+ break;
+#endif /* CONFIG_MNT_ROOTSNAP */
+ default:
+ error = ENOSYS;
+ }
- usbp->st_dev = sbp->st_dev;
- usbp->st_ino = sbp->st_ino;
- usbp->st_mode = sbp->st_mode;
- usbp->st_nlink = sbp->st_nlink;
- usbp->st_uid = sbp->st_uid;
- usbp->st_gid = sbp->st_gid;
- usbp->st_rdev = sbp->st_rdev;
-#ifndef _POSIX_C_SOURCE
- usbp->st_atimespec.tv_sec = sbp->st_atimespec.tv_sec;
- usbp->st_atimespec.tv_nsec = sbp->st_atimespec.tv_nsec;
- usbp->st_mtimespec.tv_sec = sbp->st_mtimespec.tv_sec;
- usbp->st_mtimespec.tv_nsec = sbp->st_mtimespec.tv_nsec;
- usbp->st_ctimespec.tv_sec = sbp->st_ctimespec.tv_sec;
- usbp->st_ctimespec.tv_nsec = sbp->st_ctimespec.tv_nsec;
- usbp->st_birthtimespec.tv_sec = sbp->st_birthtimespec.tv_sec;
- usbp->st_birthtimespec.tv_nsec = sbp->st_birthtimespec.tv_nsec;
-#else
- usbp->st_atime = sbp->st_atime;
- usbp->st_atimensec = sbp->st_atimensec;
- usbp->st_mtime = sbp->st_mtime;
- usbp->st_mtimensec = sbp->st_mtimensec;
- usbp->st_ctime = sbp->st_ctime;
- usbp->st_ctimensec = sbp->st_ctimensec;
- usbp->st_birthtime = sbp->st_birthtime;
- usbp->st_birthtimensec = sbp->st_birthtimensec;
-#endif
- usbp->st_size = sbp->st_size;
- usbp->st_blocks = sbp->st_blocks;
- usbp->st_blksize = sbp->st_blksize;
- usbp->st_flags = sbp->st_flags;
- usbp->st_gen = sbp->st_gen;
- usbp->st_lspare = sbp->st_lspare;
- usbp->st_qspare[0] = sbp->st_qspare[0];
- usbp->st_qspare[1] = sbp->st_qspare[1];
+ return error;
}
projects / apple / xnu.git / blobdiff